Lindsay Lohan warned Ashley Olsen to stay away from her ‘girlfriend’ Samantha Ronson at a club this past weekend.

Having reportedly spent some time drinking and partying at the Beatrice Inn and Hawaiian Tropic Zone, the Mean Girls threw a tantrum when Ashley greeted DJ Sam, gal pal of Lindsay, and rumoured lover.

An eyewitness told Page Six: "Ashley Olsen said hello to Sam at the Beatrice, and Lindsay screamed at her, 'Get your 15-year-old 'Full House' ass away from my girlfriend.'"

Whilst at the club on Saturday, Lohan claimed Ronson "was ignoring her" and became upset. "Samantha was really focused on her work and didn't leave the booth for anything," adds the source.

Firecrotch is said to be so enamoured with Sam that she’s created a Facebook profile under the name ‘Lindsay Ronson’.

Do you think Lindsay and Sam are getting up to naughty things? Be sure to leave your comments below.