What Are You Waiting For? is a song by English-Irish girl group The Saturdays. It was co-written by MNEK (credited as Uzoechi Emenike), Carla Marie Williams, Annie Rose Yuill (credited as Annie Yuill), Tim Deal, Brian Higgins, Miranda Cooper, Tove Lo (credited as Tove Nilsson), Luke Fritton, Matt Gray, Gavin Harris, Nick Hill and Toby Scott, and produced by Xenomania and Higgins. It was released on 10 August 2014, as the lead and only single from the group's first compilation album, Finest Selection: The Greatest Hits (2014).

The song charted at number 38 in the UK, making it their lowest-charting single to date. However, it peaked at number 25 on the Official UK Sales Chart and number 31 on the Downloads Chart. The song also gave the group their seventeenth top 20 hit in Scotland (the song's highest place so far) and eighteenth UK Top 40 single out of the 18 singles they have released.

The music video was filmed in Rhodes, Greece. The video shows the group partying whilst holidaying at a resort. Speaking to Capital FM, Frankie Sandford said,

It was [The Saturdays'] first two-day video shoot which was cool. We got to go away to Rhodes with First Choice, which was great. It just so happens the one that we had to shoot on the beach was stretched over two days, which was no bad thing!

The video was released on 29 June 2014. Capital FM reviewed the video positively and called it a "serious scorcher."

The song received generally positive reviews from music critics and fans alike. Lewis Corner of Digital Spy found the song to be generic, but hugely enjoyable. He gave the song 3.5 stars out of 5, and commented the song "is dazzling LOL-pop with a brilliantly electrifying chorus, pose-worthy drops and suitably obvious lyrics about having the time of your life." In an otherwise factual dissection of the video, Daily Mail's Jason Chester praised the "catchy track’s upbeat mood." In addition, Tina Campbell of Metro said it was "enough to make you want a girlie [sic] holiday, like, right now."

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