One Night with the Cowboy by Brenda Harlen

No need for a shotgun wedding this time. They're still married!

An impromptu trip to Vegas brings Brienne Channing face-to-face with her ex-husband. Except Caleb Gilmore has some news - the handsome cowboy never signed those divorce papers years ago. Still husband and wife, they rekindle their undying spark and receive the ultimate surprise. But is a baby on the way enough to keep them together when their families are wanting to tear them apart once again?