Lohan on July 2
07/03/2007 AT 08:05 AM EDT
It wasn't a Las Vegas blowout
, but Lindsay Lohan
did get an intimate, low-key party for her 21st birthday, her mother tells PEOPLE.
"(It) was a quiet lovely day with family and true friends," said Dina Lohan in an email.
The guests, casually dressed in summer beach attire, turned up at a Malibu beach house on Monday afternoon. They included Lohan's younger brother Dakota, 11, sister Ali, 13, and onetime smooching partner Calum Best, who munched on chips near the barbecue grill and chatted with a group of friends.
Also seen entering the house was Lohan friend Allegra Versace, the 21-year-old daughter of fashion designer Donatella Versace, who had gone into treatment for anorexia
Dina, who recently said that Lohan would be enrolling in Promises' extended care program
, was seen entering the house with a red bag from Cartier. She didn't reveal what was inside.
While friends stayed cool outside on sofas and lounge chairs under large umbrellas, a bikini-clad Lohan stayed indoors, occasionally peeking through the house's open back door to glance at the group of about 30 photographers camped out on the beach.
Outside the house was a patio area with large white candles near the tables, as well as hammocks, a barbecue pit and a volleyball net (which Ali and Dakota used to play tennis). Music – including Beyonce
's "Irreplaceable" and a remix of Rihanna's "Umbrella" – blared from loudspeakers, catching the attention of several beachgoers as they walked near the party house.
Lohan also marked her big day with a little gift-giving of her own: As the sun set, her bodyguard Jaz carried five boxes of cheese and pepperoni pizza to the paparazzi, and announced that they were from the birthday girl herself, "with love." In between bites, that photographers yelled in unison: "Thank you, Lindsay!" Additional reporting by MARK DAGOSTINO