The BBC's David Sillito: "It may be very English but Notting Hill's target is across the Atlantic"

The movie is the successor to Four Weddings And A Funeral - the British smash hit film of 1994 - and both Roberts and Grant will be attending the charity premiere in Leicester Square.

Click here for a review of Notting Hill

Grant's original role in Four Weddings earned him a Golden Globe and a British Academy Award, as well as propelling him to international stardom.

Julia Roberts plays Anna Scott, the world's most famous movie star

Written by Richard Curtis and produced by Duncan Kenworthy - the same line-up as Four Weddings - Notting Hill opens in the UK on 28 May.

Curtis is also famous for being a successful comedy writer, his credits including such classics as Not the Nine O'Clock News, Blackadder, Mr Bean and The Vicar of Dibley.

The charity benefitting from the premiere is Comic Relief - Curtis is one of its biggest backers. He also supports the Notting Hill Housing Trust.

Emma Chambers plays Hugh Grant's dizzy sister Honey

The film is not a sequel to Four Weddings but instead introduces a completely different set of characters, although it is still a romantic comedy.

In the film, Grant plays William Thacker, the divorced owner of a quiet travel bookshop in Notting Hill, a trendy and bohemian area of West London.

Thacker is swept off his feet one day when the most famous film star in the world Anna Scott (Julia Roberts) happens to walk into his bookshop and kiss him.