Emma Watson is dating her 'The Perks of Being a Wallflower' co-star Johnny Simmons. The actress of 21 years old, who shot to fame playing Hermione Granger in the 'Harry Potter' films - is said to have fallen for the actor of 24 years old on the set of the film drama that was filmed in Pittsburgh, Pennsylvania, they move their relation very fast as they will be lovely couple to watch both on and off screen.

A source said that, "Emma and Johnny met shooting 'The Perks of Being a Wallflower' and have gotten serious fast. She loves how down to earth and normal he is and thinks he's the nicest guy. He feels the same way about her. She doesn't act like she's one of the biggest stars in the world."

Although the relationship is still in its early stages, the pair are said to have become virtually inseparable

A second source said: "They have really fallen for one another and both aren't dating anyone else. She once said she'd never move to LA, but I think she's reconsidering ... especially because Johnny lives in Los Angeles." Emma previously dated financier Jay Barrymore but their two-year relationship ended in March 2010 after two years.