The couple were introduced through a mutual friend, according to People.
Moynahan, who previously dated New England Patriots quarterback Tom Brady, has kept her relationship with Frankel - the co-president of a Wall Street brokerage firm - mostly out of the public spotlight. However, the Blue Bloods star did share a photo from their big day on Instagram:
Moynahan shares a son, Jack, with Brady. Frankel also has three children.