Hugh Hefner and Crystal Harris have tied the knot.

The 86-year-old Playboy founder and editor-in-chief and his 26-year-old fiancee wed at the Playboy mansion on New Year's Eve in a small, intimate ceremony surrounded by their close friends and family, Us Weekly reported.

"Today is the day I become Mrs. Hugh Hefner. Feeling very happy, lucky, and blessed," Harris, the former The Girls Next Door star, tweeted on Monday prior to exchanging vows with Hefner in the evening.

"Crystal & I married on New Year's Eve in the Mansion with [brother] Keith as my Best Man. Love that girl!" Hefner tweeted shortly after marrying his bride.

Hefner and Harris got married underneath an archway of white, red and pink flowers inside the mansion. Harris wore a floor-length light pink strapless gown reportedly designed by Romona Keveza, while Hefner sported a fairly traditional black tuxedo.

After the pair were officially declared husband and wife, they enjoyed an Art Deco-themed wedding reception that reportedly also served as a big New Year's Eve party. Among the guests were Jon Lovitz, Joe Don Rooney and Gene Simmons, and jazz singer Brenna Whitaker performed with her band at the bash, according to Us.

Hefner and Harris got engaged over the holidays in December 2010 but Harris called off her wedding in June 2011 just days before she was set to walk down the aisle. TMZ recently reported that Harris had left Hefner at the time because she needed a break from their relationship to gain some independence before settling down and getting married.

Harris reportedly moved back into the Playboy mansion earlier this year, and once reunited, the couple worked things out and eventually came to the conclusion they should get engaged again and wed. News of their second engagement first surfaced in early December.

Hefner was unsuccessful with his first two marriages to Mildred Williams, whom he divorced in 1959, and to former Playmate Kimberly Conrad -- whom he has been separated from for almost 20 years but only formally divorced in 2009.

The two failed relationships resulted in Hefner's hesitation to wed again, especially with ex-fiancee Holly Madison, causing the couple to split in late 2008.

Hefner originally planned to take things slow with Harris -- who was December 2009's Playboy Playmate -- after Madison had left him due to his alleged failure to commit and lack of desire to have children with her.