At a private Hollywood party, LINDSAY LOHAN blew up at boy-oh-boy girlfriend SAMANTHA RONSON when she overheard her lusting after “Playboy” nudie gal AUBREY O’DAY, the ex-Danity Kane singer who’s made headlines for nutty babble like, (1) HITLER was “brilliant,” (2) FIDEL CASTRO is “incredibly brilliant,” (3) HEIDI MONTAG’s “Playboy” nudes were blah, and (4) she’s antsy-pantsy for sexy-lezzie Samantha!

LiLo exploded like a bottle rocket when Sam giggled to a partygoer: “WOW!...Aubrey is one hot piece of a**!”… SHRIIEEEEK!...Screamed Lindsay: “YOU STAY AWAY FROM HER!”

Ranting nonstop in a jealous rage, Mean Grrrl warned Sapphic Sweetie not to get caught eyeballing or talking to Aubrey – at a club or anywhere else.

Sighing, Sam whispered sweet nothings and finally cooled her volcanic squeeze down.

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