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Camille, 42, who was married to Frasier star, Kelsey Grammer for for 13 years. Image Credit: Supplied picture

Frasier star Kelsey Grammer and his ex-wife are gearing up for the mother of all custody battles, after the actor filed for sole custody of their two children - daughter Mason, nine, and son Jude, six.

Furious Camille, 42, who was married to the star for 13 years, has hit back at Kelsey's court filing, calling him "insensitive to our children", with pals saying she called the move "another act of creepishness" and that she would "fight like hell" to keep her kids.

"Camille is an excellent mother, Kelsey truly doesn't have a leg to stand on," said Camille's pal, Medium's Allison DuBois. "Good luck with that battle, Kelsey, you're going to need it."