Despite suffering a drug relapse on his very first day in VH1's Sober House, Steven Adler was on the straight and narrow while performing with his band, Adler's Appetite, at the Hard Rock Hotel & Casino Las Vegas' Wasted Space on February 21. "He stayed sober during his stay in Las Vegas," an insider tells In Touch of the former Guns N’ Roses drummer, who struggled with his addiction on Celebrity Rehab with Dr. Drew, and later the Sober House, after years of a drug-fueled rock ‘n’ roll lifestyle. Before sipping water at his concert, Steven enjoyed a quiet dinner at Ago, and later insisted that his backstage remain booze-free. "There was no alcohol on his rider, and people who tried to enter the green room with an alcoholic beverage were denied access," the insider adds. Whoever thought that the former bad boy could behave in Sin City?