"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, AllLike 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."
Super couples celebrate their engagements on the cover of PEOPLE
1989: Ultimate bachelor Hugh Hefner weds 26-year-old Playmate at 63