Katie Holmes reportedly wants sole legal custody of her six-year-old daughter Suri.

The actress—who has filed documents to divorce Tom Cruise based on ''irreconcilable differences'' after five years of marriage—has asked for legal custody, primary residential custody and a ''suitable amount'' of child support from her husband, TMZ.com reports.

In addition she has asked for the division of their property, although no mention of their pre-nuptial agreement is mentioned in the documents.

Tom—who is currently in Iceland filming new action movie Oblivion—is believed to have ''not seen'' the divorce documents, which were filmed anonymously in New York, coming.

Katie was scared she was turning ''into a robot'' while with Tom.

The former Dawson's Creek actress felt like she had changed ''so much'' in her time with Tom and found their relationship had become ''too much'' for her.

A source said: ''After five years of this Katie really felt like she was going crazy and that she was actually turning into the robot that the press had always made her out to be.

"Katie has actually got a great personality and she used to be spunky and feisty. She changed so much when she was with Tom, she became downtrodden and insipid.

''In the end it just got too much, she was sick of it and decided she had to do something. Basically, she grew up and lost the starstruck goggles she had been wearing.''

Katie also began to question her life with Tom and how much he made decisions.

The source added to RadarOnline.com: ''Katie did not want Tom making all the decisions in Suri's life, and that's what was going on.

"She decided it was high time she started deciding on what was best for her daughter, or at least having an equal say, and she knew that would be impossible if she remained Mrs. Tom Cruise.''

The 49-year-old actor—who already has children Connor, 17 and Isabella, 19 from his relationship with Australian beauty Nicole Kidman—recently said he did not want to have any more children because he was happy with his lot.

He said: ''I'm so happy with three. I'm enjoying every second with Suri that I have. And I'm enjoying the relationship with my older kids, and the way it is right now.''

This will be Tom's third failed marriage following splits from Nicole and fellow Hollywood star Mimi Rogers.