Nick Gruber has remained sober after a stint in rehab, but he’s still found a way to enjoy nightclubs. The former porn star and on/off boyfriend of Calvin Klein was spotted at Hyde lounge in Los Angeles, sticking to Red Bull and enjoying a set by DJ Smiles, a k a Miles Robbins, at party promoter Nima Yamini’s Avenue A Soundcheck bash Sunday night. Gruber just finished a stint at the Meadows in Arizona after being arrested in April for assault and cocaine possession, and has since been spending time in LA.