• Avril Lavigne & Lukasz 'Dr. Luke' Gottwald share writing credits on the song. Lukasz 'Dr. Luke' Gottwald & Matt Beckley produced the track.
• The single was released on March 5, 2007, certified double platinum by the RIAA, and topped the singles charts in many countries including Canada, USA, Australia, & Italy.
• The music video was directed by The Malloys and filmed at Golf 'n' Stuff in Ventura, California. It is one of the most watched videos of all time on Youtube.com (230+ million views)
• James Gangwer and Tommy Dunbar, songwriters for The Rubinoos sued Avril and her management on May 25, 2007 for similarities between their 1979 single 'I Wanna Be Your Boyfriend'
• 'Girlfriend' won the Best Song of the Year honors at the 2008 Kids' Choice Awards.