Lavigne accused of copying 1970s song

US singer Avril Lavigne is being sued by members of a 1970s rock band who claim her hit song Girlfriend rips off one of their tunes.

Songwriters Tommy Dunbar and James Gangwer alleged in a lawsuit that Lavigne and her co-writers lifted their 1979 song I Wanna Be Your Boyfriend, which was originally performed by new wave band The Rubinoos.