Even though Fatone is married to his wife of ten years, Kelly Baldwin, RadarOnline.com has learned that the former boy bander partied like a bachelor in Vegas earlier this month -- and was even spotted kissing a mystery blonde!
According to a new report in Fatone was not wearing a wedding ring when he met a hot blonde at Beacher's Madhouse in Las Vegas on February 8.
After making eyes across the room, the two connected and "kissed for 15 minutes," an eyewitness tells Star. "He had his arm around her when they left at 2 a.m."
This isn't the first time that Star has caught the boy bander behaving badly. Back in August, the mag reported that he and Baldwin had been living apart because of his problems with infidelity.
At the time, Fatone insisted that he and his wife were fine. The couple have two daughters, Briahna, 12, and Kloey, 4.
For more on how Fatone "wasn't acting like a married man," pick up the latest issue of Star, on newsstands now!