Katy Perry in $2m lawsuit with haircare brand ghd
The singer signed a $4.5 million (2.9 million) deal with the Jemella Group - the firm behind the brand - in 2011, starring in a series of adverts to promote ghd.
Katy Perry in her ghd advert
She is now threatening to sue the company, claiming it owes her $2 million (1.3 million) based on an oral agreement to extend the two-year contract, TMZ reports.
Jemella says there was no agreement, explaining that it decided against renewing the endorsement deal after market research suggested Perry's popularity in Europe had declined.
Pre-empting the lawsuit, the firm filed papers against Perry in an attempt to block her taking legal action over the disputed $2 million.
Perry said: "They're backing out of the deal because of an ownership change, and just throwing shade to hide their bad faith."
Her rep added: "Jemella's attempt to embarrass Ms Perry by including defamatory statements about her in a public filing is shameful."