Bridget Marquardt may have lived in the Playboy Mansion with Kendra Wilkinson, but she hardly recognizes her former housemate – and The Girls Next Door castmate – anymore. And that's not a bad thing.

"She's doing amazing, she's so in love," Marquardt, 35, said of Wilkinson, 23, who recently became engaged to NFL player Hank Baskett. "She's changed so much. She's not even the same person. I mean, she is the same, but she's different. I love the old Kendra and I love the new Kendra."

What is the "new Kendra"? "She's a lot more timely. She doesn't flash anymore. She's a lot more conservative. She's so in love," Marquardt tells PEOPLE.

Bridesmaids, All
Like her other housemate Holly Madison, Marquardt will be a bridesmaid at Wilkinson's wedding at the Playboy Mansion.

While her costars both appear to have found love – Madison is dating Criss Angel – Marquardt remains reticent about discussing her own love life.

"I'm just really happy for Holly. She's happy and in love," she says. "And Kendra has found love with a great guy. Hank is the perfect gentleman."