Katie Holmes is determined to be known for something other than being Mrs Tom Cruise. 

The 29-year-old actress is rehearsing for her debut on New York's famous theatreland, for her Broadway debut in Arthur Miller's drama All My Sons.

And a source tells Mail Online that Katie is working round the clock on the upcoming play.

Working 9 til 9: Katie Holmes arrives at the Hilton Theatre in New York City last week for rehearsals in preparation for her upcoming role in Arthur Miller play 'All My Sons' on Broadway

'She's doing anything up to 12 hour days,' says the source, adding that cast members have been wowed by her professional dedication.

'It's the biggest role of her life and Tom is helping her every step of the way.'

Katie  was seen in alone in New York, without husband Tom, 4, or daughter Suri, who stayed home with her father as she left rehearsals at the city's Hilton Theatre.

Suri has been with father Tom while Katie rehearses but she and Tom and throwing a house warming party for their new Beverly Hills mansion this weekend

A source said: "Tom plans on bringing Suri to New York as much as he can so they can all be together.

'He'll be back and forth to L.A. He's working on stuff too'.

Katie will be onstage six nights a week, and will co-star along stage and screen veteran John Lithgow.

A separate source says she plans to be in Beverly Hills this weekend, where they will host a party their new Beverly Hills mansion.

The source said: 'Tons of people are invited.'