Kroeger, 37, proposed to the 27-year-old singer – who, until recently, had been dating Brody Jenner – on August 8 with a whopping 14-carat diamond ring, which the magazine has photos of in its new issue. "He makes her so happy," a family source tells People. "Both of their families could not be more excited."
This will be the second marriage for Lavigne, who was wed to Sum 41 singer Deryck Whibley for three years until 2009. Kroeger split from his common-law wife, Marianne, in 2009 after seven years together. Last May, a judge in Vancouver ruled that he must pay her $25,000 a month in alimony.
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