The custody fight between 'Real Housewives of Beverly Hills' star Camille Grammer and ex-husband Kelsey Grammer is starting to get nasty. Camille filed for sole physical custody of their two children on Thursday less than a month after Kelsey did the same -- and now the battle is on.

According to Us Weekly, the reality star claims Kelsey's custody petition was "done in order to create a false impression to the media and to wrongfully disparage her," adding that he acted "in bad faith."

Kelsey's filings for sole custody would move the kids, Mason, 9, and Jude, 6, to Chicago, where he resides with his new wife, Kayte Walsh. Camille would have time with the children for half of their summer and winter school breaks -- an agreement that does not sit well with the Bravo star.