"The situation has gone from being a difficult relationship, fraught with problems that seemed solvable, to a very unhappy situation that could well end in a split," a source told Grazia magazine.
"No one would be surprised if Katie was considering her options in a worst case scenario. Katie's father (Martin Holmes, a divorce attorney) would be able to advise her on the names of the top California-based divorce lawyers should she need them," the source added.
The couple's pals, however, have dismissed the divorce rumors, insisting Katie, 30, would always fight to save the marriage. "It has often been claimed that Katie is controlled by Tom and that's not surprising given how much they adhere to the strict rules of Scientology," said the pal.
"But Katie knows Tom is a good husband and, more importantly, a great father and he loves nothing more than to shower her and Suri with gifts and attention," the pal added.