The mom-of-two smiled for the camera as she posed on the red carpet.
As OK! previously reported, Underwood, who got married to the hockey player in 2010, and Fisher have a rocky relationship as of late.
“She puts on a happy show for the cameras, but there’s a lot going on behind the scenes,” a source dished. “If you ask people who know them, they’ll say Carrie and Mike’s 11-year-marriage is far from picture perfect. The truth is they’ve had issues for years.”