Robert Pattinson's hair has gone missing.

The 'Twilight' heartthrob - who showed off his newly-shorn locks earlier this week - is concerned some of his tresses may end up being sold at auction after they vanished from the hairdresser's floor.

"Someone collected it and Rob is concerned it will end up in some tacky auction. It's probably about the most valuable hair in showbiz!"

When quizzed as to why he cut off his famous blond hair, Robert - who is dating his 'Twilight' co-star Kristen Stewart - claimed it was due to an infestation of head lice.

He joked: "I got a terrible infestation of nits and I had to shave it off."

The 'Remember Me' star showed off his new look during a romantic break with Kristen to mark his 24th birthday last week.

The 'Twilight' actor - who turned 24 on May 13 - spent last weekend at the Ritz-Carlton in Laguna Beach where they dined at the Raya restaurant before taking a midnight stroll on the beach.

A source said: "They were making small talk, not chatting a lot, but seemed very comfortable with one another. They were low-key and not bugged by other guests, left to their own devices."