And now, they're all grown up and following their own paths. Take a closer look at Hugh Hefner's four kids. Read more: Celebrity Couples With The Biggest Age Differences For many years ...

Sullivan serves as the Director of the Hefner Museum of Natural History. Steve's passion for museums as a teaching tool began at an early age. By high school, he had transformed his parent's basement ...

Hefner. From all we know of Hef ... Holly, give it all back (to his kids) or shut the f--- up!" A rep for Madison did not immediately respond to PEOPLE's request for comment.

She is most known for dating Playboy magazine founder Hugh Hefner. Madison also starred on the E! reality TV series The Girls Next Door, chronicling her life at the Playboy Mansion. In 2009 ...