Avril Lavigne and Chad Kroeger's engagement may have been a
surprise to the world at large, but the Canadian rockers are a perfect match,
according to friends and family.

"They have the same values and really
understand each other," a family source tells PEOPLE. "They complement each
other and are so happy."

Kroeger, 37, who first fell for Lavigne, 27,
while working on her fifth studio album, proposed with a stunning 14-carat
diamond ring on Aug. 8, but according to a source close to Lavigne, the couple
isn't rushing to the altar.

"They haven't set a date. They're really
enjoying this moment," a Lavigne pal says.

In an interview with HELLO!
Canada, the Nickelback frontman and "Complicated" singer spoke out about their
romance.

"I knew I was falling for her," Kroeger said of working with
Lavigne. "It was incredibly powerful and something I'll never
forget."

Lavigne, who split from Sum 41 frontman, Deryck Whibley, in
2009, admits her new fiancé's sense of humor was part of the
attraction.

"He makes me laugh every day," said Lavigne. "He takes care
of me in every way and is extremely attentive."

http://www.people.com/people/article/0,,20623359,00.html