Nick Gruber is planning to return to New York after reuniting with ex-boyfriend Calvin Klein. Sources tell us Gruber, a former erotic model, is preparing to move back from Los Angeles and restart his career. We hear he’s signed with Planet PR and is taking meetings with modeling agencies to walk the runways during September New York Fashion Week. Page Six reported in May that Gruber and Klein rekindled their relationship and took a Mexican vacation together. The couple had split in January 2012 after dating for two years, but after Gruber was arrested for assault and cocaine possession at his West Village apartment and completed a stint in an Arizona rehab facility — which Klein allegedly paid for — the troubled model fled to the West Coast. Gruber then lived with new boyfriend John Luciano, but they broke up in February, and Gruber has since taken up with Klein. The two have been spotted together at the Chateau Marmont and having dinner at the Pink Taco in West Hollywood.