Socialite Paris Hilton fled from boyfriend Doug Reinhardt's birthday party after seeing her ex-boyfriend Benji Madden was booked to perform there.
Hilton whisked Doug to Las Vegas for the weekend to celebrate his 24th birthday and watch his friends Taintsticks in action at the Hard Rock Hotel.
However, her joy turned to despair after finding out that Madden had stepped in at the last minute to play bass, reported thesun.co.uk.
"Shortly after getting into the gig Paris saw Benji's face and bolted. She was freaking out big time and was desperate not to bump into him and left. It's quite clear they didn't end on good terms," said a source.
Hilton and Madden broke up in November 2008 after nine months of dating.