A very angry Avril Lavigne who was sued by the members of a ‘70s rock band for stealing one of their tunes and using it for her hit song, "Girlfriend," fired back at the accusations calling them false and threatening to take legal action.

"I had never heard this song in my life and their claim is based on five words! All songs share similar lyrics and emotions. As humans we speak one language," Lavigne said in a letter posted on Friday on her Web site, (www.avrillavigne.com).

"I was going to be the bigger person and not reply when I read Chantal Kreviazuk's article... Our songs have no similarities and opposite meanings, i.e. different lyrics, different melody, different genres," she added.

"Let it be crystal clear that I have not ripped anyone off or done anything wrong. ... I do not deserve this negative press and attention. I take pride in the songs that I write and appreciate the opportunities to work with some great writers and musicians."

As previously reported, songwriters Tommy Dunbar and James Gangwe of the Rubinoos, filed a lawsuit in California’s Northern Federal District Court in San Francisco on July 2 claiming Lavigne’s song bears striking similarities to their song "I Wanna Be Your Boyfriend," co-written by Dunbar and released by Beserkley Records in 1978.