Celebrations for The Saturdays as they top charts for the first time

The Saturdays posted on their facebook page 'Team Sats!! We could NOT be more thrilled to be the UK's official new number one with 'What About Us'! Thanks to everyone who has supported us and the single. We love you all. This is YOUR number one too! -The Sats xoxo'

They posted on facebook 'On Saturday, Team Sats UK! Chasing the Saturdays returns tomorrow at 10pm on E! Like this photo if you'll be watching!'

The Saturdays pose for a recent photoshoot at the Empire State Building in New York

Mollie King, Una Healy, Rochelle Humes, Frankie Sandford and Vanessa White of The Saturdays promote 'Chasing The Saturdays' at the NBC Experience Store, jan 2013

Mollie King, Vannessa White, Una Healey, Rochelle Wiseman and Frankie Sanford of The Saturdays are sighted as they leave the Julien Macdonald Fashion show, feb 2012