Hugh Hefner's fiance was not bashful about flashing her new bling.
"When I gave Crystal the ring, she burst into tears," he wrote. "This is the happiest Christmas weekend in memory."
He later added: "Yes, the ring I gave Crystal is an engagement ring. I didn't mean to make a mystery out of it. A very merry Christmas to all."
Hefner has been married twice before and even seemed surprised himself when he got engaged for a third time.
"I did not find frankly in marriage the romantic connection I was looking for so I really was not anticipating a marriage again," the 84-year-old Playboy founder told E! Online. "I'm essentially a romantic, and love is what it's all about, and marriage is not always consistent with romance."
As for his 60-year age difference between him and his wife-to-be, Hefner said he's always spent his time around younger people and wants to keep it that way.
"I think a relationship with a younger woman keeps you younger," he said.
Harris was Miss December for Playboy in 2009.
Selected Reading: E! Online