David Bowie has offered to write a song for gospel singer Merry Clayton.

The 65-year-old star of Oscar-winning documentary '20 Feet From Stardom' - which tells the story of famous musician's backup singers - claims she received a phone call from the 'Fame' hitmaker just days before her film won the Academy Award.

Speaking to PageSix.com, she said: ''I got a call from David Bowie out of the blue two days ago. He told me he wanted to write my next project. I couldn't believe it when I first heard his voice. We haven't seen each other in 20 years.''

Merry has provided back-up vocals on songs by pop stars such as Tom Jones, Joe Cocker and Carole King but is best known for her duet with Mick Jagger on the Rolling Stones' hit 'Gimme Shelter'.

Opening up about her excitement over the success of '20 Feet From Stardom' Merry admitted she won't let David, 67, go back on his word.

She said: ''This is bringing so many gifts back from my past. I am not sure what my next project will be... but I will definitely hold David to his promise.''

Bowie won the Best Male Solo Artist prize at the BRIT Awards in London last month.