The duo tied the knot in 2009 after dating off-and-on for about a year.
People.com reports that Moore posted goofy pictures of the Saturday party on Instagram. The guys sported 1950s looks whereas the ladies wore party dresses with festive accessories.
Moore put on a sombrero and her good friend, actress Minka Kelly, wore a clown bow-tie.
The 29-year-old actress wrote: “Celebrating love with the greatest friends and family last night. Feeling incredibly grateful today (Sunday).”
The singer-songwriter posted a photo of her marriage certificate on Instagram last week with the caption – “The best 5 years”.