The actress/producer and her husband Brian Keathley welcomed their fourth child on Dec. 11. The couple already have daughters Gavin, 5, and River, 3, and son Hart, 19 months.
US Weekly reported the baby weighted 8 pounds 11 ounces upon arrival. Sky’s middle name is a tribute to Brian’s late sister who passed away in September 2013. Keathley is a writer and producer who has worked with Kramer on the show Take Five.
The pair founded entertainment website GeekNation in 2012.