This is why everyone thinks things aren’t so perfect down the rabbit hole at the Simpson-Wentz house. While mommy Ashlee Simpson was driving home from her hubby’s show …he was getting busy with strippers and lubricant on a make-shift slip and slide. Star magazine paints Pete Wentz as an immature rock star that sends his wife home to take care of the kid while he gets his party on.

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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 [and] dancing on a pool table with the girls.”

However, earlier in the day, Ashlee — who headed back home after attending FOB’s April 4 concert in Irvine, Calif. — Twittered: “I am beyond sad to leave my love… My heart is breaking as we drive home.” And also: “I need my hubs.”