Hollywood actress Scarlett Johansson is raising money for charity by offering members of the public the chance to go on a date with her.

The lucky winner will accompany the star to the premiere of her forthcoming movie He's Just Not That Into You in Los Angeles in June next year.

Johansson is offering the date on auction website eBay from Monday with all the proceeds going to charity Oxfam.

Other stars to take part in the scheme include Colin Firth who has offered up a date to the premiere of his new film Mama Mia! in July.

Bidding has reached more than $8,000 with the auction set to close on Sunday.