Katie Holmes - Katie Holmes 'is pretty impressive' according to her co-star

Katie Holmes 'is pretty impressive' according to her co-star

Katie Holmes has impressed her co-stars with her immense work ethic.

The 33-year-old actress - who split from Tom Cruise in June after six years of marriage with whom she shares six-year-old daughter Suri - has blown away her 'Dead Accounts' co-star Judy Greer by how hard she works both on stage and as a single mother.

Judy told Vanity Fair magazine: ''Katie is one of the hardest-working actresses I've ever worked with. She cares so much. She works so hard. She's early to rehearsal and the last person to leave.

''I've just been impressed by her work ethic, honestly, and her ability as a single mom, to juggle being an awesome mom. I mean, she's always like, 'I went to Suri's class this morning. I was reading to the first-graders.' And I'm like, 'How do you do that?' I can barely schedule in a workout and getting to rehearsal, and I'm just here by myself in an apartment. It's small. She's like got a kid, she works out every day, she's cooking dinner at night for her daughter, she manages to go and get her a new dress if she has a special thing, going to her lessons after school . . . it's pretty impressive. She's pretty impressive. I've rarely seen her without a giant cup of coffee in her hand, I will say that.''

Sources on the set of the project previously revealed that everyone was surprised that Katie wasn't a diva.

A source revealed: ''People thought they would have to step on egg shells [around her]. She's got her personal stuff going on, but she leaves that at the door. [And] behind the scenes she's a funny, loving girl, not an ounce of diva in her. They've all bonded.''