Avril Lavigne and Chad Kroeger: Engaged!

Avril Lavigne and Chad Kroeger of Nickelback fame are engaged! Few knew they were even together for six months, and now they're getting married!

Her rep confirmed the engagement to People Tuesday.

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Canadian music stars Lavigne, 27, and Kroeger, 37, first got together in February to write a song for Lavigne's upcoming fifth studio album.

"A romantic relationship blossomed as they spent time writing together," a Lavigne pal says, and on August 8, Kroeger popped the question.

"He makes her so happy," a Lavigne family source says of the soon-to-be newlyweds. "Both of their families could not be more excited."

It will be Kroeger's first trip down the aisle, and the second marriage for Lavigne, who split from Sum 41 frontman Deryck Whibley in 2009.

She was also in a serious relationship with Brody Jenner.

Congratulations to the happy couple!

[Photo: WENN.com]