WENN
The pair, who are expecting their first child on Christmas Day, wed in Los Angeles's Holmby Hills at 6:45pm.
Wilkinson, 23, was dressed in white and wore over $100,000 worth of jewellery, according to People.
Hugh Hefner and Playboy Playmate Bridget Marquardt were among the bridal party.
Fellow Girls Next Door star Holly Madison said that the bride "looked like a princess" at the ceremony.
"It was a princess dress, which was fitting," she said. "It was really pretty and she looked gorgeous."
She added: "It was a beautiful setting for a wedding."
