Showbiz
Rex Features
According to the Daily Mail, Holmes is desperate to impress in her role in the Arthur Miller play All My Sons.
She reportedly started rehearsing around the clock at the Hilton Theatre, New York at the beginning of last week.
A source said: "She's doing anything up to 12 hour days. It's the biggest role of her life and Tom [Cruise] is helping her every step of the way.
"Tom plans on bringing [their daughter] Suri to New York as much as he can so they can all be together. He'll be back and forth to LA He's working on stuff too."
Holmes kicks off her run in the play in September.
More: Katie Holmes, Showbiz
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