Barron Hilton married his socialite fiancee, Tessa Grafin von Walderdorff, in St. Barts.

Hilton, the 28-year-old son of hotel magnates Richard and Kathy Hilton, tied the knot Sunday with von Walderdorff at a church wedding with family and friends in attendance.

Hilton's sisters, Nicky Hilton and Paris Hilton, shared several photos on Instagram, including pictures of the couple outside the church.

"It's official! #TessaBarron2018," Nicky captioned a snapshot of the couple.

"Mr. & Mrs. Hilton #TessaBarron2018," Paris added on her own account.

Barron Hilton's aunt Kim Richards and her children Brooke, Whitney, Chad and Kimberly also attended the wedding.

The newlyweds celebrated with family and friends at a beachside reception in the evening.

"Loving all this beautiful & special time with my while celebrating #TessaBarron2018 @brookewiederhorn @kcjay @whittlesdavis @chaddyboy91 #grateful #love #family," Richards captioned a slideshow on Instagram.

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Barron Hilton and von Walderdorff, an American socialite, got engaged in Central Park in New York in October.

Nicky Hilton married James Rothschild in July 2015, while Paris Hilton got engaged to Chris Zylka in January.

Photo credit: Nicky Hilton/Instagram