"Irresistible" is a song by American recording artist Jessica Simpson that Columbia Records released in 2001, as the lead single from her second studio album of the same name. Its title and concept were proposed by singer-songwriter Pamela Sheyne, while Arnthor Birgisson, an acquaintance of Sony chief executive officer Tommy Mottola, and his partner Anders Bagge developed the melody and co-wrote the verses with Sheyne. It is more sexually suggestive than Simpson's previous songs.

The song, composed in the key of G sharp minor, is a mid-tempo R&B number with dance-pop, teen pop and funk influences. Instruments featured in the song include strings, synthesizers, percussion, and acoustic piano. The lyrics center on the tension between a young woman's sexual desires and her inhibitions. A So So Def remix of the piece features Lil' Bow Wow and Jermaine Dupri, and incorporates samples of Kool & the Gang's "Jungle Boogie" (1973).

The accompanying music video, directed by Simon Brand, has a James Bond theme and features scenes of Simpson dressed as a spy. A music video for the So So Def remix was also filmed, featuring appearances by Dupri and Lil' Bow Wow inter-cut with scenes of Simpson. She performed the song as part of the set list of her DreamChaser Tour (2001) and Reality Tour (2004). The single was also promoted with live performances on various televised appearances and the MTV Total Request Live Tour (2001). "Irresistible" was featured on the Disney Channel Original Series Lizzie McGuire (2001).

Critics gave "Irresistible" mostly mixed reviews. Although some listeners appreciated the song’s theme and production quality, the majority criticized Simpson’s vocal style, the sexually suggestive lyrics, and the excessive use of digital audio enhancements. The song reached number two on Poland, number eleven on the UK Singles Chart and number fifteen on the United States Billboard Hot 100, while peaking within the top twenty in twelve other countries. Despite not charting within the top twenty in Australia, it was certified gold by the Australian Recording Industry Association (ARIA) for shipments of more than 35,000 copies within the country. The song ranked on the Billboard Hot 100 and Australian year-end charts at numbers sixty-three and fifty, respectively.

Writing and recording "Irresistible" (also registered as "Irresistable" with the American Society of Composers, Authors and Publishers) was written specifically for Simpson by Swedish composers Anders Bagge and Arnthor Birgisson, in collaboration with English singer-songwriter Pamela Sheyne, who also contributed vocals for the demo. Initial recording of the song was done at the Murlyn Studios, Stockholm, for which Sheyne provided the background vocals with the final recording being done at Sony Music Studios, New York City. In an interview, Birgisson commented on the collaboration with Sheyne saying that:

"Pam came up with the title 'Irresistible', and as she started talking about the whole concept we immediately became inspired and began working on the music. You know, when we hear a concept or a title that we like—no matter if it's ours or somebody else's—both Anders and I get a feel for the song's vibe; a feel for whether a keyboard or guitar should be used to give it a certain character, be it upbeat or melancholic. So, when Pam mentioned the title, we immediately came up with the tempo and the whole feeling of the song, and then she came up with the lyrics. There was a really good flow to that song. We played around with the melody, put down the demo, and it was done."

Vocals were recorded and engineered by Robert Williams using a Sony C-800G Studio Tube condenser microphone while post-recording editing, via the Pro Tools software, was done by Peter Wade Keusch. Mats Berntoft played the guitar on the track, while Bagge mixed the song. Ted Jensen mastered it at Sterling Sound, New York City.

Composition

"Irresistible" is a moderately paced R&B song composed in the verse–chorus–bridge form with a play time of three minutes and thirteen seconds. The song draws influence mostly from the dance-pop genre while infusing elements of funk music, and Latin rhythms. The song is written in common time, in the key of G sharp minor. The tempo is ninety-four beats per minute, with a chord progression of G#m–C#m7–E–D#7. Simpson's vocals in the song span over two octaves from the low note of E3 to the high note of D#5. Cashbox Canada commented that Simpson adopts "breathy vocals" for the song, and it has a "gently danceable backing", while Chuck Taylor of Billboard noted that Simpson's vocals in the song were "funk-fortified". The Dallas Morning News Teresa Gubbins observed that the track possesses a rat-a-tat-tat beat, similar to "There You Go" (2000) by singer Pink. The song features a string section by Stockholm Session Strings as well as spoken passages by Simpson and a midsection breakdown.

"Irresistible" is a groove-laden song, following a musical setting that is beat-oriented. In an interview with Associated Press, Simpson said that "Irresistible" is "very sexy, more grown-up. I think you're going to see a new side of Jessica Simpson." Lyrically, according to Birgisson, the song carries some feminine viewpoints that Sheyne had managed to incorporate through her contribution. Ben Graham, the author of Maximum Jessica Simpson, noted that the lyrics suggest that Simpson finds it hard to keep her famous virginity image intact. This can be inferred from the lines "I know that I'm supposed to make him wait / Let him think I like the chase / But I can't stop fanning the fire / I know I meant to say no… / But he's irresistible," Bob Waliszewski of Plugged In (publication) pointed out that the verses "I can't stop fanning the fire [...] Now inescapable" refer to an "imminent sexual compromise". "She knows she shouldn't give in, but seems past the point of no return," he explained. However, Taylor stated that lyrically, the song demands for "total fulfillment". The version featured on Lizzie McGuire soundtrack replaces the lyric "When he makes me weak with desire" with "When he makes me want to move closer" and "But I can't stop fanning the fire / I know I meant to say no" with "But it's time to stop this emotion / Right now I'm gonna say no."

Remixes and release "Irresistible" was commissioned for remixes from So So Def Recordings, Hex Hector, and Dezrok. The So So Def remix of the song, produced by Jermaine Dupri, features American rapper Lil' Bow Wow and Dupri himself. It samples Kool & the Gang's song, "Jungle Boogie" (1973) and Luniz's song, "I Got 5 on It" (1995). Another remix of the song was produced by American producer Hex Hector. According to Slant Magazine, the Hex Hector remix of the song uses full-throated vocals by Simpson, and includes disco-influenced string arrangement, which is comparable to the musical style of Giorgio Moroder, and utilizes beats from a Roland TR-808. Ron Thal, the lead guitarist of the hard rock band Guns N' Roses, plays guitar on the remix tracks. Both of the remixes are included on Simpson's remix extended play (EP) This Is the Remix (2002). Brendan Frederick of Complex wrote that while the remix could not do anything to complement the original track's chart performance, it helped achieve a "gimmicky redemption". He also noted that although the samples were used in the song "Satisfy You" by Puff Daddy about one and a half year ago, the remix of "Irresistible" sounded "kinda sweet".

Sony Music Entertainment released "Irresistible" in the United Kingdom and Ireland on April 12, 2001. In the United States, "Irresistible" was first commissioned as a radio-only single, on April 17, 2001. Later, a promotional CD single was issued, containing the album version of the song. A vinyl was also released, on June 26, 2001, which includes the remixes of the song. In France, the single was released on April 27, 2001, as a maxi-single and vinyl. The pressing contains the album version as the A-side, and the So So Def remix as the B-side. Sony Music released a CD single of "Irresistible" in Germany, on June 25, 2001. Sony Music Holland released the song as a single in the Netherlands on June 23, 2001. In Australia, "Irresistible" was released on July 2, 2001, as a CD single. The same day, it was released in Sweden through Sony Music. The song is also included on the Italian compilation album Festivalbar (2001).

Critical reception "Irresistible" was received with mostly mixed reviews by music critics. Although a few critics called the song a "peppy" number, others commented that they did not like the song, and criticized the sexuality of its lyrics and the over-usage of digital sound manipulators. Stephen Thomas Erlewine of Allmusic stated that the song and "A Little Bit", the second single released from the parent album, were a "double-punch" and picked the former song as a standout from the album. Cashbox Canada, ranking the song at number ten on "Top 10 Love Songs: The Crush", praised it as "an ode to love at step one". Similarly, Chuck Taylor of Billboard reviewed "Irresistible" favorably, calling it "a sexy, uptempo romp about new found love that proves Simpson's pop intuition." In another review, Taylor complimented the contemporary appeal of the track and felt that it would be a staple at radios. He also noticed that the breakdown and spoken passages of the song gave it a "street edge", something not previously heard from Simpson. Teresa Gubbins of The Dallas Morning News had mixed feelings towards the song in her review, writing that its sound might help Simpson get attention on urban radios, but did nothing to demonstrate her voice. Larry Printz of The Morning Call also expressed a similar view of the song, stating that the song "is loaded with platitudes, but [it's] easy on the ears."

However, Siobhan Grogan of NME magazine stated "to the delight of lonely men everywhere, she tells us she's 'weak with desire' and knows 'I'm meant to say no'—and the mind boggles at how she'd have turned out if she'd spent her teens glugging cider on a street corner." Chuck Campbell of Daily News viewed the song as "gurgling" and noted that Simpson was singing it breathlessly. An editor of The Advocate remarked that the track sounded more manufactured than composed. Craig Seymour of The Buffalo News wrote that he felt "Irresistible" was a "limp seduction tune". Similarly, David Browne of Entertainment Weekly wrote that the single could have been easily reprocessed for a "new virginity ad campaign." The Northern Echos Hayley Gyllenspetz dismissed the song, elaborating that it sounded similar to the works of Britney Spears and Christina Aguilera. She added, "If only this 21- year-old songbird had done something original she may indeed have been irresistible." An editor of The Malay Mail echoed Gyllenspetz's comment, writing that the track sounded like a typical Aguilera pop-Latino piece. Simon P. Ward from Dotmusic compared the song to the work of Britney, Christina, and Jennifer Lopez and felt that "Irresistible' will doubtless further Simpson's cause as the next poster girl for all discerning adolescents. The pop conveyor belt rolls on…". In 2003, "Irresistible" won a Broadcast Music Incorporated (BMI) "Pop Music Award". Irresistible ranked at number 87 on Top 100 Pop Songs of 2001 by About.com.

Chart performance North America