Showbiz
WENN
Hilton, who turned 28 on February 16, had hired New York's Butter nightclub to celebrate her birthday with friends and family.
According to OK!, the Wrestler star arrived at the venue unannounced at around 2am, unaware that he was crashing a private party.
A source revealed that when one guest asked Rourke why he was at Hilton's party, he replied: "Whose party? I'm not. I don't know...We're having our own party!"
The unnamed insider added that Rourke was a big hit with partygoers, who lavished him with attention and well-wishes for Sunday night's Oscars.
Other guests at the bash included ex-'N Sync singer J.C. Chasez, oil heir Brandon Davis and Aubrey O' Day.
> Click here for our recent interview with Mickey Rourke
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