The Gosford Park star and husband Jack Waters are parents to Juliet, five, and two-year-old Dylan and the actress admits she's become more focused on motherhood than movie sets.
But Watson has to keep working - because she's the main income provider in the household.
She tells Britain's The Independent, "I don't feel ambitious anymore. I really don't! It's such a pleasure going to work, and I love my job, but if I had to give it up tomorrow, I would. But actually I can't because I'm the breadwinner and I have to keep going. So I won't. I have to find a way of making it all work and putting it all together."