Always in the limelight for saucy speculations, Hefner's been married twice before but lived the single life between 1959 and 1989.
Harris tweeted: With @Cissy729 and my sister in-law @cayaukkas! The bride wore a strapless gown in soft pink, Hefner a black tux.
Today is the day I become Mrs Hugh Hefner, Harris wrote on Twitter. The band continued to play through the night as guest arrived for the big annual NYE party.
Hugh Hefner celebrating the new year as a married man once again!
'Love that girl!' tweets Hugh Hefner after marrying 'runaway bride' Crystal Harris.
Hefner posted a picture of himself in a tuxedo with his bride under an arch of pink and white flowers at the wedding ceremony in the Playboy Mansion in Beverly Hills, California.
The San Diego native, whose parents are British, said she asked for Christmas ornaments rather than lingerie at her pre Christmas bridal shower to help decorate Hefner's famed mansion.
All photos have been tweeted by Harris and Hefner. The start of 2013 had wedding bells ringing for the Playboy chief again. Yes! Hugh Hefner got married to girlfriend Crystal Harris.
Fond of flowers? This adorable bunch at what the newly wed had in their marriage.