The duo joined host Julie Chen on stage to discuss this season's gameplay and share the exciting announcement, reported E!Online.
"I always say no one comes in between me and my man," Rachael said before adding, "except a Brenchel baby!"
The reality stars tied the knot on September 8, 2012 atop LA's AT&T Center and the bride arrived at her lavish nuptials via helicopter.
Big Brother's Matt Hoffman officiated at the ceremony, and fellow reality TV couple Jeff Schroeder and Jordan Lloyd were among the 130 guests.