Lindsay Lohan off the wagon

Lindsay Lohan has fallen off the wagon yet again, it has been claimed.

The 'Mean Girls' star - who spent two months in rehab last year for alcohol addiction - was seen drinking vodka at New York hotspot The Box on Friday night (25.01.08) as she partied with shipping heir Stavros Niarchos, DJ Samantha Ronson and 'The Hills' star Brody Jenner.

A fellow clubber told the New York Post newspaper: "Lindsay took a swig of vodka from a bottle of Grey Goose. She was trying to keep a low profile and covering her face."

The 21-year-old actress was said to be all over 24-year-old reality TV star Brody at the club, but then moved on to the 1 Oak club with Paris Hilton's ex Stavros.

A witness there said: "Lindsay wasn't drinking." Lindsay's representative refused to comment. She last fell off the wagon on New Year's Eve when she was seen gulping champagne from the bottle at a party. Meanwhile, Lindsay is said to have 'split' from her 'sober buddy' Courtenay Semel.

Courtenay accompanied the 'I Know Who Killed Me' actress everywhere and slept in an adjoining room when she stayed in hotels, to help encourage Lindsay to avoid alcohol. But Courtenay, Yahoo! chairman Terry Semel's daughter, is said to have cut all ties with Lindsay as she was jealous of the time she spent with her other friends.

A source said: "I think it was a jealously issue. Every time Lindsay had a girlfriend around the house, Courtenay started acting all weird. She'd go up to her bedroom and start texting Lindsay - even though they were in the same house! It was like Courtenay wanted Lindsay all to herself."

Lindsay is now reportedly planning to employ a female model named Alex as her 'sober buddy'. The source added to America's Star magazine: "Alex has a boyfriend who really likes to drink. This could lead to trouble."