The couple revisited their wedding day with a ceremony Friday, People magazine reported Saturday.
"Renewed our vows today....it's incredible to thank each other for the past year as husband and wife. Here's to another great year!" Rimes tweeted Friday.
Rimes, 29, gave Cibrian, 38, a watch to mark the milestone, and Cibrian returned the favor with a ring, People said.
As part of the romantic celebration, the two took to the beach Saturday.
"Eddie and I went climbing on the rocks in the ocean yesterday to see the thousands of crabs," Rimes tweeted Saturday.