Lindsay's Sobering Birthday Bash

Tue., Jul. 3, 2007 10:26 AM PDT by Sarah Hall

It may not have been the Vegas birthday bash she envisioned, but Lindsay Lohan still managed to turn 21 in style—if without the shots.

The rehabbing star left Promises treatment center on Monday to host friends and family at a low-key party held at a private beachfront residence in Malibu.

Her mother, Dina, and younger siblings Ali, 13, and Dakota, 11, flew out from New York for the reportedly booze-free event, which was also attended by Lohan's onetime romantic interest, Calum Best, and Nicole Richie's onetime fiancé, DJ AM.

Partygoers were spotted bearing shopping bags from Cartier, Hermès and Louis Vuitton, presumably holding stylish gifts for the fashion-conscious birthday girl.

As her guests lounged outside on beach chairs, a bikini-clad Lohan alternated between hiding out from a crowd of about 30 photographers and snapping back at them with a telephoto lens of her own, which she also used to take pictures of her guests.

Proving that she was in a celebratory mood, the actress even sent out for five pizzas and had her bodyguard deliver them to the paparazzi "with love," People reports.

At about 2:15 a.m., Lohan called it a night and returned to Promises, where she has decided to remain for an extended course of treatment.

The actress checked into rehab on May 28, following a memorable Memorial Day weekend during which she was arrested for DUI after crashing her Mercedes into a curb.

Though police said they discovered a "usable amount" of a substance believed to be cocaine on the scene, the District Attorney's Office has yet to file any charges against Lohan.

After reports surfaced last week that the Georgia Rule star had cocaine in her bloodstream and a blood-alcohol level nearly twice the legal limit at the time of her arrest, her high-powered attorney, Blair Berk, blasted the Beverly Hills Police Department for leaking unverified information.

Police spokesman Lt. Mitch McCann said he was unable to confirm the details of the preliminary investigation and that the department would be preparing a final report in the coming days.

Lohan is due to be arraigned Aug. 24.