Girls Aloud star Kimberley Walsh and members of Jls and The Saturdays joined British Chancellor of the Exchequer George Osborne at a tea party for sick children at his official London residence on Tuesday (21May13). Osborne hosted the bash for seriously ill youngsters at his home at 11 Downing Street to mark the 10th anniversary of U.K. kids' charity Rays Of Sunshine. Celebrity guests included JLS singers Aston Merrygold and J.B. Gill as well as The Saturdays' Mollie King, Vanessa White and Una Healy. Merrygold, a longtime supporter of the organisation, tells U.K. TV show Daybreak, "It was an amazing day, really, really good. Big thanks goes out to the Chancellor for hosting the party. "What makes Rays Of Sunshine so special is the fact that we've met so many kids over the years. You're always meeting new kids and it's amazing when they're recovering and getting better. You do hear some terrifying stories but we see them over and over again (at events and) you actually get to see their journey and see them recuperate."