Emma Watson's parents have banned her from seeing Johnny Borrell, it has been claimed.

The 'Harry Potter' star's mother and father "went mad" after finding out their 17-year-old daughter had been partying with the Razorlight frontman last week, and have now forbidden the pair meeting again.

A source close to the family told Britain's Daily Mail newspaper: "They told Emma in no uncertain terms that she's not to see Johnny again."

"They have always kept a strict eye on their daughter and are very protective parents.

"It was a huge shock to see their little girl coming out of a party with hell raiser Johnny on her arm. He's 10 years older than her and he's admitted to being a drug addict in the past."

Emma - who plays schoolgirl Hermione Granger in the hit movie franchise about a teen wizard - and Johnny, 27, were spotted together at London's National Portrait Gallery last Monday before partying at nearby nightclub Dolce.

However, Emma insisted there was nothing going on.

She said: "At London Fashion Week I met Johnny Borrell and we went on to a party hosted by designers PPQ in the same cab. I'd never met him before so that was great as I'm a big Razorlight fan."

"But goodness, I am really going to have to watch who I stand next to from now on!"