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"And that's important too – I do hope I set a good example with my work ethic."

She added: "It's important for my son to see that in action, so when he comes to set, he hangs out, he knows when to be quiet and he even calls 'action', which is really funny."

She admitted being an actress was a "fairly self-involved profession", with having a child the "very best thing that can happen".

Saying her focus had "broadened", she added working parents enjoy their career "more because you realise it's not the most important thing".

Describing her perfect day, she told the magazine it would be spending time with her son, making breakfast, walking to their best friend's house and playing sports.

Speaking of their close relationship, she claimed he was still a "mummy's boy", saying: "He will brush my hair and he likes to tell me things we are going to do together when he grows up."

She added her relationship with her son is "really close", speculating his talent for performing may mean he follows her into acting when he's older.

Driver, 43, was speaking out in support of Children In Need, as she confesses hearing the moving stories made her "incredibly grateful" for what she has.

She added that being able to help others is the "best side of fame", as she auctions a signed ornamental Lindt bear to raise money for the charity.