From PEOPLE Magazine Click to enlarge
Every girl needs a shoulder to cry on postbreakup, and Britney Spears, after her split from Kevin Federline, has found one in Paris Hilton. "They've definitely bonded," says Hilton's rep Elliot Mintz. The fast friends, both 25, met up in Vegas and went on a weeklong hot spot marathon. "Paris is extremely protective of her; they're upbeat and laugh a lot," says Mintz. Will the Paris & Britney tour go on? "I don't think any human being can keep this pace up," he jokes. "But I expect them to continue being very social."

VEGAS, BABY!
NOV. 19
After dinner at Tao, Britney and Paris partied well into the night at Tryst, Playboy Club, Light and Caramel Lounge before finally winding things down at 5:30 a.m.

THEY SHARE COATS!

BLONDE BONDING
NOV. 22
The day after hosting celebs from Ashlee Simpson to Flavor Flav at her "Holiday House Party" Nov. 21, Paris escorted her new BFF (wearing coordinated animal prints) to Teddy's at the Hollywood Roosevelt Hotel, where they rented out the Marilyn Monroe suite by the pool.

RETAIL THERAPY
NOV. 25
At Malibu's Planet Blue boutique, Paris helped Britney get dolled up (left) and played auntie to Britney's 14-month-old son Sean Preston. "Britney is a very conscientious mom," says Mintz. "Paris goes back with her to Malibu and when [Sean and Jayden James, 2 months] wake up, their mother is home."

THEY SWAP STOCKINGS!

GIRLS' NIGHT OUT
LATE NIGHT, NOV. 25
At Hyde Lounge (where they ran into the Olsen twins), Britney and Paris left the club at 6 a.m. (above). While inside, Britney inexplicably slipped on one of Paris's stockings. Otherwise, "they were just a couple of girlfriends having a drink at the bar," says an onlooker.

THREE'S COMPANY
NOV. 26
Despite a spat with Paris the night before, Lindsay Lohan (left) joined the pals for a long night that started at L.A. hot spot Guy's and ended at Paris's house.