"Girlfriend" a song by Canadian pop-punk singer Avril Lavigne, released as the lead single from her third album, The Best Damn Thing. It was produced by Lukasz Gottwald. "Girlfriend" became Lavigne's biggest hit in the United States, where it became her first number one single in the U.S. Billboard Hot 100. It topped the chart in Australia for 6 weeks, and reached number two in the United Kingdom. A remix featuring rapper Lil Mama was released in June 2007. The music video is notable for being the most watched YouTube video of all time, with about 118,000,000 views as of April 2009[3] and also the most discussed music video.