Kelsey revealed that Walsh is pregnant at the Golden Globes on Sunday (January 15), just hours before he took home 'Best Actor In A Television Drama' for Boss.
Camille was initially reported to have been blindsided by the news, but has taken to Twitter to clarify that she's known about Walsh's pregnancy for quite some time.
"We are happy for him and his wife… There is no need to hold on to any negativity," Camille tweeted. "I have known for a couple of months. It wasn't much of a surprise."
Camille and Kelsey finalised the terms of their divorce in February 2011 after several months of negotiations.
Kelsey married fourth wife Walsh just two weeks later at Broadway's Longacre Theatre.
Walsh previously suffered a miscarriage early in her and Kelsey's relationship.
> Camille Grammer: 'Keeping Kelsey Grammer's last name is easiest'