Kris Humphries, Vinny Guadagnino Have "Boys Night Out"

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Bromance is brewin'!

Kim Kardashian's hubby Kris Humphries has found a new BFF in Jersey Shore's Vinny Guadagnino. A source tells Us Weekly that Humphries, 26, and Guadagnino had a "boys night out" Tuesday at STK in L.A. The duo, sans Kardashian, 31, "seemed to be in good spirits."

Humphries and Guadagnino flew together from New York to Las Vegas earlier this month. "Kim slept the entire time while [Vinny and Kris] chatted the whole way," an eyewitness tells Us.

But Kardashian isn't too crazy about her hubby's partying ways. A source tells the new Us Weekly, on stands Friday, that the newlyweds had a huge fight days before Kardashian's Oct. 21 birthday. "They had it out!" a family friend tells Us. "She told him he needs to do something productive... He needs to get off his ass, like, yesterday."

The pair famously married after just nine months of dating. "On some levels," says the friend, "she feels like she made a mistake."