Heiress' blood-alcohol level measured .08

Paris Hilton has had a run-in with the police over drinking one margarita.

The heiress/recording artist was arrested in Hollywood during the wee hours on Thursday, Sept. 7 and charged with driving under the influence, reports TMZ.com. She says that she "regrets it occurred."

Hilton and her passenger, gal pal Kimberly Stewart, were pulled over around 12:31 a.m. in Hollywood. Because of the celebutante's erratic driving, police suspected intoxication and administered a Breathalyzer test, which read .08, the miniumum blood-alcohol level that is still considered illegal in California.

A cooperative Hilton was then ushered to the Hollywood LAPD division for booking, where she was met by her publicist Elliot Mintz, sister Nicky and Nicky's boyfriend Kevin Connolly of "Entourage." After being held for only about an hour and a half -- the usual is about three hours -- Paris was released on her own recognizance as the paparazzi began to gather around the police station.

On the drive home, Paris picked up a pack of cigarettes and explained that she had been up for 24 hours shooting a music video with nothing to eat the entire day. Mintz added that his client had also attended a charity event, an Us Weekly magazine party and visited one nightclub-- all of which conspired to make the one margarita she drank during the day all the more powerful on her already exhausted, depleted body.

Despite TMZ's best efforts, they were not able to get their hands on Hilton's booking photo. According to an unidentified source at the police station, the picture wasn't as unflattering as some of the more notorious celebrity mugshots, explaining, "Look, it ain't Nick Nolte, okay?"

If convicted of a misdemeanor DUI, Hilton could face up to three months' probation, have her license restricted for 90 days and ordered to enter an alcohol program.

Hilton has had minor brushes with the law before, once in November 2005 when the police pulled her, Stewart, boyfriend Stavros Niarchos and "Laguna Beach" star Talan Torriero over after Niarchos hit a parked car while pulling away from a nightclub. They were released shortly afterward, and Hilton was seen on video blowing the cops a kiss and saying, "Thank you, officers. We love the police."

Also, previous theft charges were dropped against her for stealing her own sex tape from a newstand. Hilton was caught on camera swiping the "One Night in Paris" DVD and then allegedly tearing down a poster advertising the video. The Los Angeles District Attorney's office decided it was not "in the interest of justice" to prosecute the hotel heiress.

Hilton released her self-titled album in August and hit the Billboard 100 as high as No. 18 with the reggae-influenced "Stars Are Blind." A fifth season of her reality show, "The Simple Life," with ex-friend Nicole Richie is in development over on E!