Emma Watson looks pretty in yellow at the party. Image Credit: Supplied photo

Actress Emma Watson was confronted in the woods by a stalker while she was shooting for “Noah” in Oyster Bay, Long Island.

The 22-year-old recognised him as a man suspected of haunting her before and he tried to hand over a letter to her, said an insider, reports thesun.co.uk.

“The man managed to slip on to the set with some visitors and then approached her. She recognised him from hanging around outside her house and screamed,” said a source.

“He took off into the woods and was chased by security and a couple of the tough stunt guys who also happen to be martial arts fighters. They caught up with him in the woods. Police were called and he was removed by security. It was really creepy. Emma was really shaken up and was given some time to compose herself,” the source added.

Watson is popular for playing Hermione in the “Harry Potter” films.

Her new film “Noah” also stars Russell Crowe and Anthony Hopkins and is due for release in spring 2014.

“It's been a really tough shoot for her. The movie has been gruelling anyway and this left a very sinister feeling hanging over the set,” said the source.

The man was not arrested or charged, but was warned about trespassing.