Hefner, Harris announce wedding date

Hugh Hefner has announced that he will marry his girlfriend Crystal Harris on June 18.

The 84-year-old Playboy - married twice before - announced his engagement to 24-year-old Harris on Christmas Day.

"It's official: Crystal & I will be married on Saturday, June 18 at the Playboy Mansion," he wrote on Twitter. "Happy days!"

Also confirming the news, Harris simply tweeted: "6.18.11".

The couple made the announcement as they carried out a joint interview with Piers Morgan on Piers Morgan Tonight.

> Harris 'doesn't notice Hefner age gap'