That nothing amounted to something – big – as the song's infectious hook and "hey, hey, you, you" chants propelled the song to No. 1 on the May 5 Hot 100 chart, becoming Lavigne's first and only chart-topper to date.
"Girlfriend," the first single from her third LP, The Best Damn Thing, represented a slight sonic shift for Lavigne, who traded in the midtempo moodiness that defined previous hits like her 2002 debut "Complicated," which reached No. 2 on the Hot 100, and "My Happy Ending," for the kind of high-octane pop melody and punk riffs found on her 2002 top 10 hit, "Sk8er Boi."
Her success invited legal troubles, however. Tommy Dunbar and James Gangwer, two songwriters of The Rubinoos' "I Wanna Be Your Boyfriend," sued Lavigne, producer Dr. Luke and RCA Records, among others, for copyright infringement, claiming "Girlfriend" ripped off their 1979 song. Though Lavigne disputed the allegations, the parties arrived at an undisclosed settlement in early 2008.
Post-"Girlfriend," which has drawn 432 global YouTube views to date, Lavigne has landed 10 more Hot 100 hits and released two full-lengths since The Best Damn Thing. She plans to release her first album in five years in 2018.