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Sugababes star Keisha Buchanan says the trio have struck up a close friendship with Rihanna while recording in America.

Rihanna has become the "fourth Sugababe".

The 'Umbrella' singer has been advising the British trio - who have signed a record deal with Jay-Z's Roc-a-Fella label - while they are recording in America and has struck up such a close bond with the 'Ugly' stars, they have grown to regard her as part of the band.

Singer Keisha Buchanan - who makes up the group with Amelle Berrabah and Heidi Range - told Britain's Daily Star newspaper: "We keep missing Jay-Z. Every time we're gonna hook up he's off partying with Diddy or someone, but Rihanna has been a huge help to us. She's been like our fourth members, listening to all our songs and saying what she liked and what she didn't."

Keisha also heaped praise on new singer Cherri V, who releases her debut single 'Until The Sun Comes Up' next week, for her "refreshing" sound.

She added: "I'm so pleased she's breaking through. Her sound is so refreshing."