It seems like Lindsay Lohan just can't stay sober

Los Angeles - Lindsay Lohan was spotted falling over and "reeking" of alcohol following a party to celebrate her new sobriety-focused reality TV show, Lindsay.

The 27-year-old actress - who recently claimed she was "clean and sober" during an appearance on The David Letterman Show - invited pals to New York's Gramercy Park for the screening earlier this month, where she was reportedly seen stumbling around and smelling strongly of alcohol.

A source told Star magazine: "Lindsay was laughing at herself and having drinks. When she stepped inside the elevator, she reeked of booze and could barely stand!"

"She was walking in a zigzag, and everyone in the lobby was staring. She was definitely not sober."

Despite her vow to stay away from alcohol, the troubled star fuelled yet more rumours she was struggling to stay on the wagon when it was reported she had enjoyed an alcoholic drink at the Coachella Valley Music and Arts Festival on Saturday.

Lindsay - who recently completed her sixth stint in rehab - was accused of consuming vodka with a group of friends during Kid Cudi's set.

A witness told InTouchWeekly.com: "She looked completely out of it. She couldn't stand up straight and she was frantically chain-smoking cigarettes. In one of her hands she had a plastic cup with a clear liquid in it. She didn't seem to care who saw and none of the group seemed concerned."