Russian pop star Lena Katina is facing a lawsuit over allegations she breached a contract by firing her manager.

The t.A.T.u singer's manager Tristram Buckley claims he was the driving force behind a reunion between Katina and her bandmate Yulia Volkova in celebration of the 10th anniversary of their huge hit All The Things She Said last year (12).

He accuses the star of wrongfully terminating his contract, and is demanding at least $20 million (£12.9 million) in damages. Buckley is suing for fraud, breach of contract and defamation.