Rick Ross has launched legal action against LMFAO over a line they used in their smash hit 2011 track 'Party Rock Anthem'.

He claims that the duo's line 'Every day I'm shufflin'' is derived from his own lyric 'Every day I'm hustlin'', which features in his 2006 song 'Hustlin''.

The lawsuit says: "The use of 'Hustlin'' in 'Party Rock Anthem' is readily apparent, despite the slight change from 'Every day I'm hustlin'' to 'Every day I'm shufflin'' and constitutes, inter alia, the creation of an unauthorised derivative work."

It adds: "The phrase is so important to the success of 'Party Rock Anthem', that LMFAO launched a highly successful clothing line, Party Rock Clothing, that features the phrase on T-shirts and other clothing items."

The legal action was launched by 37-year-old rapper Ross and his songwriter Jermaine Jackson.

They are looking to win an injunction and statutory damages.