Grey's Anatomy star Justin Chambers has worried fans.

According to Star, an eyewitness at the Village Pub in tony Palm Springs, Calif. claims Chambers drifted in and out of consciousness (at the bar!), rambled incoherently, annoyed patrons and even hit on a waitress!

"Everyone thought Justin was drunk because he kept passing out at his table," the eyewitness tells Star. "But when I asked the bartender what they'd been serving him, she swore it was only non-alcoholic beer!"

"He was acting as if he was on drugs, like some kind of downers. His eyes were glazed over. He slurred his words and staggered when he tried to walk," the eyewitness added. "At one point, he was hunched over a table, then abruptly woke up and shouted out of the blue, 'I am a father of five kids! I am a damn good father! Leave me alone!' It was really unsettling."

Justin, began hitting on a waitress! When she showed no interest, he slapped money out of her hand. "As she picked it up off the floor, he said, 'That's right, bitch, that's where you belong. Pick up the money!' "