The Jimmy Kimmel Live! host, 45, officiated the sunset ceremony on Saturday in St. Lucia as Matt and Luciana renewed their vows 10 years after their first meeting, PEOPLE has learned.
The couple confirmed their commitment to each other in front of 50 guests, including their four daughters, Kimmel's fiancé Molly McNearney, actors Ben Affleck, his wife Jennifer Garner, Casey Affleck and Don Cheadle.
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The source adds that with 85 degree weather and blue skies, "It was a beautiful and relaxing weekend for guests. Matt and Luci went all out. Guests were flown in to the tropical island via private jets and were treated like royalty. Everyone enjoyed the sun and water activities, including snorkeling and paddle boarding. Guests were also treated to local, gourmet food and drinks."
And just a day after the ceremony, the couple was spotted strolling on the beach.
"Matt and Luci seemed to enjoy a quiet moment together. They strolled on the beach hand-in-hand and looked like newlyweds. They were smiling and looked very happy together," says the source.