Beautiful and 23...

... Crystal Harris is marrying an 84-year-old man.

ADDED: Or maybe she's 24.

While she was studying psychology at San Diego State University, she started modelling and was noticed by Playboy. She met Hefner on Halloween in 2008 and started dating him in January 2009 while he was also dating identical twin glamour models Kristina and Karissa Shannon. But he ended his relationship with the twins in January this year and has remained monogamous to Crystal since. Crystal once said that she believes she and Hefner were able to bond because she lost a long-time boyfriend in Iraq and he was going through a break up with Holly Madison, whom he dated for 8 years.

It all fits together!