Perhaps acting out after the demise of his literary career, Nick Gruber, the 23-year-old ex-boyfriend of Calvin Klein, "got into a scuffle at the Chateau Marmont in West Hollywood on Tuesday night," the Post reports. According to an informant, at 1:30 a.m. Gruber ordered a burger, but became "agitated" upon learning the kitchen had closed for the evening — and he was ultimately head-butted by a security guard. Gruber called the police and threatened to sue the hotel, adding, "André [Balazs] should have a nicer staff." Really, André. The hotel wouldn't speak to "Page Six." Gruber's last tweet is from February 25: "Relaxing day at the spa."