Pete Wentz Parties with Strippers while Ashlee's Home with Bronx

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While Ashlee Simpson is staying at home with son Bronx, and sharing photos of him on Twitter,Pete Wentz is out partying it up with strippers in Vegas.

The Fall Out Boy bassist -- who was without his wife of nearly one year -- partied hard with about 50 band members, dancers and pals (including Girls Next Door star Holly Madison) following a sold-out show at the Palms Casino Resort on April 5. "Everybody was going absolutely crazy," an eyewitness tells Star. "People were even drunkenly playing makeshift Slip 'n' Slide with a mat and lubricant. And Pete was in great spirits. He was dancing and singing along to his band's own songs, grinding up against the dancers." At one point he was "dancing on a pool table with the girls," the partygoer adds.

Should Ashlee be pissed?

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