Marc Jacobs' Fiance Caught Cheating on Designer

| by Celebrity Mound

Marc Jacobs’ “The Whole Equals the Sum of Its Parts” speech at the CFDA Awards Monday night isn’t the only thing that has fashionistas wondering if the hunky designer and his Brazilian fiancé, Lorenzo Martone, are whole or apart.

Martone, the head of ARC PR and a newly minted swimsuit designer, according to WWD, was nowhere to be found at the Council of Fashion Designers of America’s equivalent of the Oscars – or in Jacobs’ acceptance speech. Some eagle-eyed nightlifers are wondering if Martone’s make-out session with another man late last week had anything to do with his conspicuous absence.

After winning the CFDA’s Womenswear Designer of the Year award at Alice Tully Hall, Jacobs told the crowd that the maxim he’d learned in math class – “the whole equals the sum of its parts” – also applied “to putting on a show and getting out a collection.” When Jacobs proceeded to thank the people who had paved his way to the podium – “my parts” – audience members expected some kind of acknowledgement of the dashing Martone, to whom Jacobs became “engaged” in March 2009 after the two had dated for a year.

But Jacobs never mentioned his beau, giving credence to longstanding rumors that things had cooled between the revered fashion designer and the former model. Oddly enough, the studly duo seemed quite together at last Thursday’s amfAR Inspiration Gala at the New York Public Library.

“They were holding hands during Cyndi Lauper’s finale, ‘True Colors,’” says a spy who attended the benefit. “Lorenzo gave Marc his hand, and Marc put it in his lap. It totally looked like they were a couple, to everyone who was watching.”

The pair left the amfAR party with pop singers Ricky Martin and Lance Bass and headed to The Park restaurant on 10th Ave. in Chelsea to celebrate Wilhelmina Models CEO Sean Patterson’s birthday. When Patterson invited a group of friends to continue the celebration at his SoHo apartment on Wooster St., Martone accepted the invitation, but Jacobs didn’t. And that’s where Martone might have gotten into hot water with Jacobs.

Insiders tell Gatecrasher that one of the male guests at Patterson’s home caught the eye of Martone. To complicate matters, the guest had arrived with his girlfriend. One thing led to another, and the sources say the woman caught her boyfriend in a lengthy liplock with Martone and freaked out. A messy argument erupted, with “lots of yelling,” one source says, and the situation only got uglier from there. Was it so messy that Jacobs got wind of it?

The designer could not be reached for comment by deadline, and when Gatecrasher ran our story by Martone, he declined to comment. Stay tuned.