Calvin Klein’s Porn Star Boyfriend 

According to numerous media outlets, the only thing getting between C.K. and his Calvins these days is 20-year-old male model Nick Gruber -- also known as gay-porn performer Aaron Skyline.

Gruber goes by Skyline on the gay adult site Next Door Male. He's filmed a gay scene with porn star Mason Wyler and appeared in a group sex scene for Next Door Buddies.

According to Gawker, Gruber also appeared in a series of underwear shots under the name Nick London on the website ModelMayhem.com.

Gruber has been photographed with Klein at multiple events this summer, with The Huffington Post and Gawker referring to him as Klein's boyfriend and the New York Post's Page Six taking it one step further, calling Gruber his partner.

Gawker notes that Gruber's appearance has undergone a change in the past year -- most notably significant work to his teeth. In 2008, Klein told Vanity Fair he's "experienced sex with men, with women."