Stone said she has been writing songs for the past year

Come Together Now, released as a single in the US on 29 November, features the Celine Dion, Wyclef Jean, Joss Stone and more than a dozen other artists.

Proceeds will go to relief charities Habitat for Humanity and Angel's Place.

"Every time this song gets played and gets bought we're building houses and saving kids," said Stone, currently shooting a film about Robert Kennedy.

Compilation album

Stone said she had been writing songs with various collaborators for the past year.

She worked with songwriters Denise Rich, Mark Feist and Damon Sharpe on Come Together Now, which has been available to buy on the internet since 17 October.

The single will also form part of a compilation album called Hurricane Relief: Come Together Now.

The album will include contributions from Elton John, John Mayer, Barbra Streisand and James Brown.