While most kids spend Saturday afternoons at the park, Kendra Wilkinson's children got a tour of her previous home … the Playboy mansion!

"We went up to the mansion tonight to visit Hef and Crystal. Was an amazing night catching up with everyone. #oldstompinggrounds #family," the 30-year-old captioned a shot of the gang, including Playboy founder Hugh Hefner and his much younger wife Crystal Harris.

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Accompanied by hubby Hank Baskett, we would love to know how Kendra introduced five-year-old son Hank IV and 17-month-old daughter Alijah to Hugh ("Meet my 89-year-old ex-boyfriend, kids!")

The blonde beauty rose to fame thanks to her time as one of the publisher's girlfriends, appearing on the reality show The Girls Next Door from 2005 to 2009.

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If only Hank IV and Alijah knew what went on there at night…