Brittany Mahomes. Courtesy of Brittany Mahomes/Instagram Pregnant Brittany Mahomes opted for a cozy game day, cheering on husband Patrick Mahomes and his Kansas City Chiefs teammates on TV. “Baking and watching Daddy,” Brittany, 29, wrote via Instagram Story on Wednesday, December 25, referring to husband Patrick’s away game in Pittsburgh. In the photo, Brittany and 3-year-old…