Before partying with Paris later on at the Four Seasons, our girl Brit decided to attend the Scandanavian Style Party - a house party in Beverly Hills - at 10:10 p.m., says our Xclusive inside source. And it looks like her, Sam, Alli and yes, Paris, had a blast!

BSPEARSPARIS120107_39.jpg

BSPEARSPHILTON1201PART2_02.jpg

Our inside source tells us that a fur coat, worth thousands of dollars, was given to both Brit and Alli by a Scandinavian vendor ("Berglund of Copenhagen"). "Brit loved it and wore it all night!"

BSPEARSPARIS120107_04.jpg

BSPEARSPARIS120107_07.jpg

And when it was close to midnight, "a chocolate cake - with fresh raspberries - was brought out with candles and everyone sang Happy Birthday!" Aww, how sweet!

Britney Spears BSPEARSPARIS120107_24.jpg

"She [Britney] looked like she was in a very good mood, very excited!" says our source. Brit and her pals left the party at 12:05 a.m. - oh, and guess who played host(ess) at the party? SHARON STONE! Weird, huh?

Look inside for more!