Gwen Stefani and Pharrell Williams sued over Spark the Fire song

Gwen Stefani and Pharrell Williams are facing a lawsuit over their hit song Spark The Fire.

Richard Morrill, who previously served as the singer's hairdresser, claims Stefani's tune, which she co-wrote with Williams and released in 2014, features some strikingly similar lyrics to a track he played her during a style appointment back in 1998.

The original song, titled Who's Got My Lighter?, was by his former group L.A.P.D. and Morrill is now reportedly seeking a percentage of the $25 million profit from the single, reports TMZ.com.