The mom-to- be joined her husband at the Playboy Kick-Ass 2 Party late Friday evening. Donald joked around on the red carpet as his wife giggled and looked on.
Nearby, a "Patron Train" went by, with actors like Captain America stars Frank Grillo and Anthony Mackie going for a ride.
"She's rallying for me tonight, it's great, " Donald shared with In Touch about his smiling wife.
Inside the party, Donald stuck close to CaCee's side as she bypassed the Patron cocktails and sipped on coconut water instead. Donald briefly hit the dance floor, but ran back to CaCee in the VIP area where he lovingly rubbed her stomach.
Due in the next few weeks, CaCee is due to give birth to a son, the first child for the couple who wed in December of 2012 in Los Angeles.