Just two days after announcing their split, Tom Cruise and Nicole Kidman are headed for divorce court, their publicist confirms.

Cruise on Wednesday filed for the big D in Los Angeles County Superior Court. He cited irreconcilable differences as the reason for the split. He also requested joint custody of the couple's two adopted kids, Isabella Jane, 8, and Conor Anthony, 6. According to court documents, Cruise and Kidman have been separated since December, just shy of their 10-year anniversary. On Monday, Kidman and Cruise dropped the bomb that they were "regretfully" separating by issuing a brief statement blaming "divergent careers which constantly kept them apart" for their uncoupling. According to a USA Today report, their publicist, Pat Kingsley, put out the statement as a preemptive strike against the National Enquirer, which was working on a breakup story. Enquirer editor Steve Coz told USA Today he first learned of the separation last Friday and he said there is "more than one reason" to blame. USA Today also reported that it was Kidman, 33, who initiated the split and Cruise, 38, was pouting around the set of his current film, the Cameron Crowe-helmed Vanilla Sky. On Wednesday, however, there were rumors circulating that Cruise and his costar in that film, Penelope Cruz, had become an item, and that precipitated the breakup. Other reports said the two had a falling out over religion: Both are practicing Scientologists, but Cruise is one of the church's posterboys and most vocal defenders. Kingsley, meanwhile, would only confirm Cruise had filed for divorce and refused to offer any comment other than the original separation statement. Cruise was just getting over the end of his first marriage, to Mimi Rogers, when he and Kidman fell for each other on the set of the 1990 car racing flick Days of Thunder. Rogers and Cruise officially dissolved their union and Tom and Nicole got hitched that Christmas Eve in Telluride, Colorado. They vowed never to spend more than two weeks apart.