The singer partied all night Hilton, and the two stars finished off the night smoking a cigarette on a balcony at the Four Seasons Hotel in Beverly Hills.
They spent most of the evening at a party organized by Sharon Stone. Spears’ two friends, Sam Lutfi and Alli Sims were with them.
A source stated, "She looked slim and pretty. We really hope this birthday and her new age will be a turning point."
Spears received many gifts during the evening including $30 000 worth of furs, $10 000 worth of gold and diamonds, as well as hair products.