Kyra Sedgwick Edie Sedgwick Cousin, Schwimmer is also second cousin ofactor David Schwimmer, best known for his character Ross Geller on the sitcom Friends.Lacey grew up in a Mormon (The Church of Jesus Christ of Latter-day Saints) household in Redlands, California. Her parents are Laurie Kauffman and notable West Coast Swing dancer Buddy Schwimmer. She is the younger sister of Benji Schwimmer, winner of the second season of So You Think You Can dance.

Schwimmer has been training and dancing competitively since a young age. At age seven, she and partner Brian Cordoba danced in the 1995 U.S. Open Swing Dance Championships. At age ten, she and partner Blace Thompson placed 1st in the Young America Division at the 1998 U.S. Open Swing Dance Championships. Schwimmer went on to have annual top rankings at the U.S. Open Swing Dance Championships and has won numerous U.S. titles.