Lindsay's Prom-Themed Birthday Bash

 Image by wenn.com

Lindsay Lohan turned 22 yesterday, and instead of having a huge Vegas bash, she opted for a low-key prom-themed birthday party.

Lohan and 50 guests partied at Teddy's lounge inside the Hollywood Roosevelt Hotel. Her date for the night, Samantha Ronson took the theme very seriously. She arrived with Lohan wearing black pants, a tuxedo shirt, bow tie and top hat with red trim, while Lohan wore a bright pink strapless minidress.

Just after midnight, a cake featuring Marilyn Monroe on it was wheeled out and the entire lounge sang "Happy Birthday" to Linds. Sources at the party say she seemed to be in great spirits and that her and Sam would sneak small kisses all night. Also in attendance was Lindsay's mom Dina and Jamie Lynn Sigler.