Lindsay Lohan's 21st Birthday Party

Lindsay Lohan rings in her 21st birthday like a good girl — with close friends and family at a beach house party in Malibu on Monday. Her Las Vegas plans may have been dashed but that didn’t stop the now-legal singer-actress from partying at Courteney Cox‘s Malibu home!

Lindsay, who left the Promises Rehab Center for her birthday bash, was seen in a skimpy nautical bikini by L Space and killer Miu Miu wedge heels.

She snapped photos with a digital camera and an SLR with telephoto lens. paparazzi.

Pictured in this entry: mom Dina, sister Ali, brother Dakota/Cody and ex-boyfriend Calum Best.

30+ pictures inside of Lindsay partying her legal butt off…