And while Rochelle Wiseman was noticeably absent from the line-up, spending time bonding with newborn daughter, Alaia-May, mum-to-be Frankie Sandford was there to prove pregnancy isn't slowing her down.
Sporting the long, tumbling tresses she debuted last week, Frankie matched bandmates, Mollie King, Vanessa White and Una Healy's basque and shorts combos for the festival performance in a billowing purple and black colour-block top and skinny jeans with a strappy bra top showing underneath.
Braving heels for the girls' dance routines, she tweeted in-between performances: "Having an amazing foot massage backstage while listening to The Wanted sound check. I suppose someone's got to work! Lol."
To make up for their absent fifth member, The Saturdays were joined by Rochelle's hubby Marvin Humes for a a photo before he opened the gig with a DJ set.
He shared the pic, captioning it: "They're missing my baby @RochelleTheSats don't worry Roch I'm gonna fill in today!!! X" [sic]
We're sure they did Rochelle proud.