Barton Parties Until She Vomits In New York City

Former The O.C. star Mischa Barton showed she can party with the best of them in New York last week when she refused to let a bout of sickness stop her fun.

The actress was partying with pals Jamie-Lynn Sigler and Kirsten Dunst, and reportedly kept drinking, even after running outside a club to throw up on the sidewalk.

The 21-year-old star was celebrating at New York City hotspot The Anchor when she reportedly became ill.

An eyewitness tells Us Weekly, "They were partying, going crazy. At one point Mischa suddenly ran out the door and threw up outside.

"Jamie-Lynn ran outside after her, but it wasn't a big deal. They were laughing."

The witness added, "They just went back inside and continued to party."