By Debbie Emery - Breaking Celebrity News Reporter

Former party guy Mike "The Situation" Sorrentino appears to have been taking sobriety seriously after checking into rehab last March, despite being plagued by recent claims that he has fallen off the wagon and lapsed back into bad boozing habits.

The Jersey Shore star was allegedly spotted on September 26 "downing so many cocktails, he could barely stand," an eye witness at the London West Hollywood told Us Weekly, "He isn't sober anymore," they claimed.

However, Breaking Celebrity News can exclusively reveal that the reality star was just hanging out with friends at the hotel rooftop and although they were drinking the Sitch didn't indulge.

"He was not drinking," Sorrentino's rep, Cindy Guagenti told Breaking Celebrity News. "He was at the cabanas at the pool at the London with about 12 people. There was a pitcher of sangria there for the other guests but he did not drink anything alcoholic."

The rumored return to his past demons was surprising for the Sitch, who has stuck to the straight and narrow for the past seven months and even survived filming season six of the Jersey Shore without a hitch, and he is still