Kevin Costner and his son Cayden
Gerardo Mora/Getty
The actor, 53, and Christine, 34, were married in Colorado in 2004. The couple's first son, Cayden Wyatt, was born in May 2007. Costner also has three children from his first marriage to Cindy Silva.
Before baby, though, Costner has a different kind of celebration. His country music album will be released in November.
• For more information on Christine’s pregnancy, visit PEOPLE's Celebrity Baby Blog
