Sorrentino checked into rehab earlier this year to get treatment for a "prescription medication problem".
However, a recent report from Us Weekly claimed that the reality star "isn't sober anymore", adding that he had been seen "downing so many cocktails he could barely stand".
Sorrentino's rep has now dismissed the reports, insisting that the 30-year-old was simply spending time with friends.
"He was at the pool at the London [hotel in West Hollywood] in a cabana with twelve other people and there was a pitcher of sangria for the other people," the spokesperson told E! Online. "He did not drink any alcohol."
Sorrentino, who has previously admitted that rehab felt "impossible" at first, will star in the final season of Jersey Shore when it premieres tonight (October 4) on MTV.