No strangers to drama, Paris Hilton and Nicole Richie had local security on high alert over the weekend.

Things got tense around 2 a.m. Sunday when Hilton’s ex-boyfriend Stavros Niarchos realized she and boyfriend Benji Madden of the rock group Good Charlotte were being seated close to the Greek shipping heir at Blush nightclub at Wynn Las Vegas.

Witnesses said Niarchos dashed out of the club as soon as he saw the couple. The rocker reportedly has a beef with Niarchos, who wasn’t taking any chances, given his hasty solo exit.

About 45 minutes earlier, Richie, who recently had a baby with Joel Madden, Benji’s brother, was involved in a catfight in the valet area at the Hard Rock Hotel.

Security whisked Richie away, according to spies.

Hilton and Richie had attended the Good Charlotte concert at the Hard Rock pool before joining the Maddens and entertainment producer Jeff Beacher at Wasted Space, Carey Hart’s new club at the hotel.

Richie, whose daughter is 5 months old, recently vowed she would not be getting in trouble anymore “because I want my child to look up to me. … I want to show her the right path.”(source)

Label: Nicole Richie, paris hilton