Emma Watson completed filming 'Beauty and the Beast' exactly 15 years after 'Harry Potter'

Speaking on the Radio 1 Breakfast Show with Nick Grimshaw, she said: "It's so weird. It's one of those full circle moments as I did my last day on 'Beauty and the Beast' as Belle and I was driving home and saw stuff reminding me that it was 15 years to the day that I was cast as Hermione.

"It's so crazy. It's more than half of my life."

Meanwhile, Emma - who stars in new movie 'Regression' with Ethan Hawke - admitted that choosing what movies to star in can be a "gamble".

She said: "Sometimes I'm really baffled about what to do about a certain project, the right director, right cast, enough money to get it made properly - all of these disparate elements have to arrive at the same perfect moment. Sometimes it happens, sometimes it doesn't. It's a bit iffy.

"It always feels like a gamble. Sometimes you'll get all of the perfect elements in place and it still won't be a good movie. Or you think it might be a disaster and it turns out really well."