Hugh Hefner has set a date for his U.S. wedding to 24-year-old British Playmate Crystal Harris, a Playboy representative said Wednesday.

Hefner, 84, has been married and divorced twice.

He will marry Harris at the Playboy Mansion June 18 in Los Angeles, a Playboy publicist told Wednesday.

Fewer than 150 guests are expected to be invited to the ceremony.

Harris is considering wearing a strapless dress by designer Romona Keveza, an unnamed source told