Britney at Kiss FM's Jingle Ball feat. Tinashe and a birthday cake!

Britney took the stage yesterday at Kiss FM's Jingle Ball performing a medley of hits, including her latest single Slumber Party (available on iTunes now) with none other than Tinashe. However the real highlight of the night was the cake that Ryan Seacrest brought out at the end of the show, celebrating the Queen's 35th birthday.

Slumber Party performance with Tinashe

Womanizer breakdown

Cake moment:

Also here's Brit with Lance Bass and his very cute husband

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