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A Playboy Bunny never forgets.

Kendra Wilkinson thanked Playboy Magazine founder Hugh Hefner on his 91st birthday via Instagram on Sunday.

KENDRA WILKINSON SAYS HOLLY MADISON IS 'GROSS AND WRONG' FOR PLAYING THE VICTIM

The 31-year-old former centerfold became a household name when she was just 18-years-old and found herself living in the Playboy Mansion alongside fellow Playmates Holly Madison and Bridget Marquardt. The three models, recognized then as Hefner’s girlfriends, became stars on E!’s hit reality TV series, “The Girls Next Door.”

Wilkinson would eventually leave the Mansion to live with her now-husband, former American football wide receiver Hank Baskett, in 2009.

Wilkinson maintains a positive relationship with Hefner, describing him as “family” and “an angel.”

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“I had a really great experience being at the Playboy Mansion,” Wilkinson told Fox News in an interview last year. “Yes, of course there was some sex involved and everything… but in my life, it was the right choice for me to make. I had a great time living there. Hef treated us really well. He gave us everything we wanted and more. He made sure we were all happy.”