Lindsay Lohan celebrated her birthday with her alleged girlfriend Samantha
Ronson yesterday (07/02/08).

The 'Mean Girls' actress, who turned 22, dined at Beverly Hills' La Scala
restaurant with the DJ and several other friends.

Before the meal, the pair spent the afternoon shopping in Los Angeles and
browsed at shops including exclusive jewelery store Cartier.

Lindsay sparked rumors she was in a lesbian relationship with Samantha -
who is the sister of super producer Mark Ronson - after sending intimate
messages to her over the internet last year.

Recent reports claim Lindsay plays the submissive 'wife' in the
relationship.

A source said: "Lindsay and Samantha are totally playing house and loving
every minute of it. And, yes, they share a bed!

"They both play certain roles. Lindsay is the passive one, the wife. It
works for them!"

Lindsay has recently been busy on the set of her latest movie 'Labor Pains',
a comedy in which she plays a woman who pretends to be pregnant in order to
prevent her boss from firing her.