OK, we may be a day late - but we'd just like to wish the newly reformed (fingers crossed!) Lindsay Lohan a very happy 21st birthday. And actually - despite the fact she's currently residing in rehab and faces a legal battle over her recent car crash - it sounds like our Li-Lo did have a happy day. The Mean Girls star was allowed out of rehab for the afternoon - but only travelled a few miles along the California coastline to Courteney Cox-Arquette's Malibu beachhouse. Just to clarify... Courteney wasn't actually there at the time, but she was happy to lend Li-Lo her house for the low-key birthday bash. Guests included Lindsay's mum Dina, her siblings and best friend DJ Samantha Ronson. The group hung out by the pool while Li-Lo tried out one of her new presents: an impressive-looking camera. At least, we think it was a gift - or she could have just swiped it from one of the many paparazzi who descended on the beachhouse, too.