She sure kept this one hidden, but sure with his good looks, we'd want him all to ourselves too.

Emma Watson is reportedly dating tech entrepreneur William 'Mack' Knight for the last four months, reports The Sun. The pair have apparently just finished their first holiday together in sunny California.

The actress first met the businessman in September and the pair are said to be just home from a romantic €9,000-a-night getaway.

"Mack is just a normal, down-to-earth guy who has nothing to do with Hollywood and Emma loves that," a source told The Sun.

"They're really happy with each other and see each other whenever Emma does not have work commitments."