Lindsay Lohan celebrated her 22nd birthday party with a 1980s-themed prom night party in Hollywood on Wednesday (02Jul08).

The Mean Girls star took over Teddy's at the Hollywood Roosevelt Hotel, where Nicole Richie's former fiance DJ-AM played host.

Insiders claim Lohan wore a slip dress for a family dinner before the party and then changed into a Bradley Bayou frock.

At the stroke of midnight, the actress was presented with a birthday cake featuring the face of her heroine Marilyn Monroe.

Then, Lohan's best friend - and reported girlfriend - Samantha Ronson took over the DJ booth from DJ-AM and played records until the party finished at just after 1am.

According to Eonline.com, guests included Joel and Benji Madden, David Spade and Rod Stewart's son Sean.