Lavigne, 31, recently disclosed her battle with Lyme disease, reported E!Online.
"Good to be back at the Junos Awards," she wrote on Instagram after posing on the red carpet.
"Feeling healthy and enjoying the positive vibes here ?#JunoAwards #Canada."
While wearing a black dress with neutral-colored heels, the "It's Complicated" singer flashed a giant smile on her face.
Nickelback lead singer Chad Kroeger was by her side more than seven months after they announced their separation.
This isn't the first time the pair has reunited after announcing their separation. Back in March, the music artists shared pictures working in the studio together.