The publishing mogul wed the 27-year-old former model at his Playboy Mansion in Beverly Hills, California on 31 December, 2012, and he has decided to mark their first 12 months of marriage by throwing a lavish bash at the same venue.
Hefner posted a picture of the party invitation on his Twitter.com page, adding, "Our annual Nye party and one year wedding anniversary is just around the corner... Looking forward to toasting... with Crystal Hefner at the Playboy Mansion for Nye. It's good to be in love..."
He also posted a picture of the couple on their wedding day, adding, "Our happiest 1st wedding anniversary Dec 31."
Hefner and Harris were originally set to walk down the aisle in 2011, but the blonde beauty called off the wedding.
They reconciled in May, 2012 and Hefner proposed for a second time last December (12).