Katie, Nicole, Mimi – they were all 33 when their marriages to Tom Cruise ended

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Here's an odd fact: Tom Cruise doesn't stay married to women beyond their 33rd birthday.

Since news broke that Katie Holmes has filed for divorce from her hubby of five years, celeb watchers have been quick to spot a weird phenomenon: All three of Tom's wives split from him at the age of 33.

Mimi Rogers was 31 when she married Tom in 1988, and 33 when they split two years later.

Nicole Kidman ~~signed the contract~~ walked down the aisle at 23, and was served with divorce papers at the age of 33.

And now there's Katie Holmes: 28 when she tied the knot in 2007, 33 when she filed for divorce last Thursday.

Is this a numerology thing? A Scientology thing? A weird Tom Cruise thing?

Discuss.

In other Katie Holmes conspiracy theory news, the recently-single mum is reportedly being trailed by surveillance crews, presumably hired by Tom or the Church of Scientology.

"The men are traveling in a black Mercedes SUV and a white Escalade, and have appeared to be following Katie for the last couple of weeks," RadarOnline reports.

Katie and her daughter Suri are currently living in a New York apartment that Katie secretly signed a lease on before springing divorce papers on her hubby last week.