Britney Spears celebrates her birthday into the wee hours of the night at The Scandinavian Style Mansion event at a private residence on Sunday in the exclusive enclave of Bel Air, Calif.

Britney turns 26 today. Hope she got a more fabulous birthday cake at home!

Brit wore a slinky black minidress, purple panties, a white fur-trimmed jacket and YSL Tribute platform shoes.

Also Pictured: ‘cousin’ Alli Sims, Diamond Entertainment owner Claus Hjelmbak and BFF Sam Lufti.

HAPPY BIRTHDAY, BRITNEY!!!!!!!!!