Who He Is: The lead singer of the band Nickelback, who you might know for songs like "How You Remind Me" and "Far Away" or because hearing the word "Nickelback" makes you slightly nauseous.
How He Knows Avril: The two were introduced as writing partners for songs on one of her albums.
Birthplace: Hanna, Canada
Profession: Record producer, Guitarist, Songwriter, Entrepreneur, Musician, + more
Credits: Spider-Man, Transformers: Revenge of the Fallen, Daredevil, Charlie's Angels: Full Throttlesee more on Chad Kroeger
Who He Is: Stepbrother to the Kardashians and (mostly) reality TV personality from TV show "The Hills".
How He Knows Avril: The two met while dining at Koi. She sent shots to him and his friends and the friendship soon turned romantic.
Birthplace: Los Angeles, California, United States of America
Profession: Television presenter, Television producer, Model, Actor
Credits: The Princes of Malibu, The Hills, MTV Video Music Awards 2008, 2009 MTV Movie Awardssee more on Brody Jenner
Who He Is: The singer of rock band Sum 41
How He Knows Avril: The two Canadians both had songs on the American Wedding soundtrack and struck up a friendship when Avril was just 17.
Birthplace: Toronto, Canada
Profession: Record producer, Guitarist, Songwriter, Musician, Actor, + more
Credits: Dirty Love, DeeVeeDee, Sake Bombs and Happy Endingssee more on Deryck Whibley
Who He Is: An actor, probably best known as Fez from the TV series "That 70s Show".
How He Knows Avril: The pair met while Lavigne was still married to Deryk Whibley and began dating shortly after the divorce was announced.
Birthplace: Miami, Florida, United States of America
Profession: Television director, Television producer, Actor, Voice acting, Singer, + more
Credits: That '70s Show, Fast Food Nation, Handy Manny, Unaccompanied Minors
Also Rankedsee more on Wilmer Valderrama