Inside Mandy Moore & Ryan Adams' 5th Anniversary Party

This past weekend, singer/actress Mandy Moore and indie rocker Ryan Adams celebrated five years of marital bliss with a formal '50s theme party with their closest friends, including actress Minka Kelly and Cupcakes & Cashmere blogger Emily Schuman.

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"Everyone was told to wear their best '50s prom outfits," a source told Us Weekly. "People were toasting Ryan and Mandy. They were lovely together. Slim Jim Phantom performed all night and was playing hillbilly rock tunes."

The private couple tied the knot in Savannah, Georgia on March 10, 2009, just a month after announcing their engagement. "She was thrilled to be getting married," the pastor who married them told People at the time. "She was giddy, but not in a childish way. She was obviously so happy."

Five years later, she's still just as giddy over her husband. On their anniversary, she posted a photo of their marriage license, captioned "The best 5 years..."

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By Kristen Klein