Harris said that 84-year-old Hef's energy level often surpasses the blond bombshell, who was Playboy Playmate of the Month in December 2009. "Last year for my birthday, I wanted to go bowling. And last year of his birthday he wanted to go to Las Vegas and go to two different nightclubs at the Palms!" the model said.
Hefner reportedly popped the question to Harris on Christmas Eve, after the pair finished watching a movie.