avril-engaged.jpgWe didn't even realize that they were dating!

Avril Lavigne's rep has confirmed that the 27-year-old singer is engaged to Nickelback frontman Chad Kroeger, 37.

While the couple haven't publicly commented on their relationship, Lavigne did tweet back in February that the two were working on her upcoming album together (she posted the pic below and wrote "Bro'ing out with Chad Kroeger in the studio"), and today she re-tweeted a congratulatory message from his bandmates.

Kroeger reportedly presented the Canadian singer with a 14-carat diamond engagement ring on August 8. "He makes her so happy," a source tells People magazine. "Both of their families could not be more excited."

This will be Lavigne's second marriage and Kroeger's first. She filed for divorce from Sum 41 rocker Deryck Whibley in October of 2009 after three years of marriage, and in January she split reality star Brody Jenner after two years of dating.