Frankie Sandford, Rochelle Humes, Mollie King, Una Healy and Vanessa White have chosen the upbeat pop track as their next song and we reckon it's going to be a hit.
The single has been taken from their forthcoming album Finest Selection: The Greatest Hits and will be released on 10 August.
But before then, you can listen to 'What Are You Waiting For?' below. The tune was written by the same team behind The Saturdays' 2011 hit 'All Fired Up', which landed at No 3 in the charts, so fingers crossed for this one!
Last night, Frankie took to Twitter and gushed about the new single. She tweeted:" What are you waiting for?! What are you waiting for?! Tell me what are you waiting for?!!!!!!"
Excited much, Frankie?!
'What Are You Waiting For?' is released on 10 August followed by Finest Selection: The Greatest Hits on 11 August.