Camille Grammer -- Stay Out of Our Home, Kelsey Grammer!

Camille Grammer rushed to court Wednesday for an emergency order to keep Kelsey Grammer and his new family out of the home he once purchased with the "Real Housewives of Beverly Hills" star ... TMZ has learned

For some reason, Kelsey wants to move back into the 10,657 sq ft. mansion, even though he just bought another house in the same zip code.

Sources familiar with the situation tell TMZ there is an enormous mortgage on the property -- which is draining both Kelsey and Camille -- and they have been trying in vain to unload the property. They currently have the house listed at $16,000,000, having just lowered it by a million.

We're told Camille fears if Kelsey moves back in, it will be even more difficult to sell -- and according to the divorce settlement, Camille gets half the profit.

The judge did not issue an order Wednesday, but rather set a hearing for next month.

Kelsey's people will not specifically say WHY the actor wants to move back into the Beverly Hills pad -- but Stan Rosenfield, Kelsey's PR guy, only said this, "The only statement that needs to be made is the one made by the judge. Motion was denied."