The Up hitmakers have temporarily relocated to California in a bid to launch themselves in the U.S. and are being followed by E! Tv cameras for their own reality show.
White was presented with a special cake by the crew to mark her big day, which coincided with the band's gig at The Roxy Theatre - and she continued her 23rd birthday celebrations with a few lucky fans after the concert.
In a series of posts on her Twitter.com page, White writes, "Omg (oh my God) the crew at E just got me an Ice Cream Cake!!!!! I'm sooo happy right now! Never had one before but it is on Another level!!!! Best bday (birthday) ever! Round 2 tomorrow! Bring it on!
"And thanks for everyone coming to the roxy tonight was epic! Also loved hanging out with fans that came out for a drink afterwards was so nice... come again!"