It was co-written by Joe Belmaati, Michaela Breen, Vince Clarke, Mich Hansen, Alison Moyet, John Reid, Remee and Ina Wroldsen.

"If This Is Love" was first released by Fascination and Polydor Records on 27 July 2008 as the lead single from Chasing Lights.

[4] "If This Is Love" was written by Joe Belmaati, Mich Hansen, Vince Clarke, Alison Moyet, John Reid, Remee and Ina Wroldsen for the group’s debut album Chasing Lights.

Vanessa White sings the call in the second verse as well as backing vocals after the middle 8 and during the final chorus.

The song lyrics refer to love-hate relationships, the definition of love and its complications that can lead to situations of stalking.

The verses are all about one of them stalking the other one, hanging out outside the other's window.Healy also elaborated on how excited the group were about releasing "If This Is Love": [...] Getting our first single out there is going to be amazing.

It garnered comparisons with the music produced by the likes of Girls Aloud, Depeche Mode, Sugababes, Robyn and Rachel Stevens, and was praised for its Yazoo sample and catchy chorus.

[18] Nick Levine of Digital Spy reviewed the song: "This debut single is nothing that Rachel Stevens couldn't have given us three or four years ago: a midtempo electropop tune with a memorable chorus and a crafty Yazoo sample slipped in for bonus street cred.

"[11] Mike Barnes of musicOMH positively reviewed the single: "The track itself is the obligatory fluffy summery pop we can't seem to manage without at this time of the year, replete with auto-tuned vocals that sound as though they've simply been parachuted in over a dance track to make it radio friendly.

[12] DJ Ron Slomowicz from About.com labelled the single as "pop-perfection" and noted an influence of Spiller's 2000 song "Groovejet (If This Ain't Love)" in the intonation of the chorus.

[4] Mickey McMonagle of the Sunday Mail gave the single a five-star rating, calling it "catchy", a "brash pop song" and that "added impact comes from Yazoo's sample".

[22] Peter Hayward of musicOMH described the song as follows: "'If This Is Love' is a jolly blend of techno, disco and dance similar to the likes of Girls Aloud and Robyn.

"[23] Gary Ryan from City Life said that the song surpassed the recent efforts of The Saturdays' girl group contemporaries; Sugababes and Pussycat Dolls.

[25] Fraser McAlpine of the BBC gave the single a four out of five star rating, saying: Essentially there are two very good elements in play here: the Yazoo sample, and the chorus.

[27] The single was also the second highest new entry of the week behind Katy Perry's "I Kissed a Girl" which debuted at number four.

[27] On 14 September it fell fourteen places to number 61 in its seventh week on the chart before dropping out of the top 75.

[27] Following the release of Chasing Lights and the popularity of follow-up single "Up", "If This Is Love" re-entered the chart after an absence of six weeks, at number 71 on 26 October 2008.

[27] Altogether, "If This Is Love" spent a total of nine weeks within the chart and has sold over 110,000 copies in the United Kingdom alone.

[29] The group was pleased with the chart position "If This Is Love" achieved, Mollie King explained in an interview with Digital Spy: We were thrilled!

[32][33] Upon the filming of the music video, Wiseman commented on the experience: We had so much fun, it was a very long day but we enjoyed every second of it!

King wore a berry print waist banded slim fitting satin dress with a pair of little black heels and a little silver diamante Playboy necklace.

This aimed to give imagery to the viewer that they can dress like The Saturdays and be part of their group and fanbase.

[35] The video begins with the group's logo flashing onscreen before moving into the setting of a backstage dressing room which enables passers-by to have a view of the activity within, similar to a display window.

The setting then moves in what seems to be an evening scene where the girls are getting escorted by the music video's production crew to performing live onstage in front of a cheering audience.

The crowd can be heard cheering ecstatically as the group is escorted by the production crew off the stage before moving onto the final setting.

[34] Prior to the tour, White mentioned: "We can't wait to get out and sing it in front of loads of people, it's going to be brilliant".

[38] 24 July 2008 saw the group perform "If This Is Love" on British lunchtime television programme Loose Women as part of the single's pre-release promotion.

[5] Catrin Pascoe of the Western Mail positively reviewed a performance of the song on the tour, mentioning: "[...] they got me up on my feet dancing and singing along.

"[18] At another date of the tour, the performance of the song received a negative review from Rick Pearson of the Evening Standard: "'If This Is Love' was a nervy set-opener with the band looking and sounding unsure and exposed.