Kendra Wilkinson Goes Postal After Forgetting Stamp

By Brian Orloff

04/06/2009 at 05:25 PM EDT

Kendra Wilkinson is preparing for marriage and independent life – and she's learning some very important life lessons as she goes.

"The first time I mailed something on my own, like a couple of months ago, I didn't put a stamp on it," Wilkinson, 23, tells Celebuzz of a recent revelation. "My mom, she was like, 'Are you serious? You didn't put a stamp on your mail?' I'm like, 'Dude, I've never been on my own before, how am I supposed to know?' "

Adds the former Girls Next Door star, who previously lived in the Playboy mansion: "That was the biggest blonde moment of my life. It was a check too. I don't know where it went to!"

And Wilkinson will be doing her learning in front of the cameras. She is working on her own reality show, Kendra, which she describes as a cross between I Love Lucy and Jessica Simpson's former MTV show Newlyweds.

"The first couple episodes [show me] adjusting to my new life," she says of living outside the mansion with fiancé Hank Baskett. "Then it goes into the wedding."