See Hugh Hefner's Fiancee's Engagement Ring!

Credit: Brian To/FilmMagic

Bring on the bling!

Six days after 84-year-old Playboy magnate Hugh Hefner proposed to December 2009's Playmate of the Month Crystal Harris, 24, the bride-to-be showed off a picture of the sizeable rock on her Twitter page.

"For those of you who have been asking to see my ring here it is," the Girl's Next Door star Tweeted. "My engagement ring from my love."

And Harris, who started dating Hefner in January 2009, has been getting a little love from her man's former gal pals.

"Congratulations!" Kendra Baskett wrote on her Twitter page Sunday. "How exciting! Wishing you both the best!"

Bridget Marquardt, meanwhile, sent the happy duo a box of wedding-themed Sprinkles cupcakes.

"We shared Bridget Marquardt's "I Do" cupcakes while we were playing Uno," Hefner wrote on Twitter.