Chad Kroeger proved he is Avril Lavigne's biggest fan as well as her fiance when he rocked out at her latest gig.
The Here's To Never Growing Up singer played a secret gig at The Viper Room in West Hollywood to over 2,000 people, including Jack Osbourne, and People.com reported Nickelback rocker Chad was there to support his bride-to-be.
An onlooker revealed: "Chad was extremely supportive throughout the evening. He was rocking out to Avril's performance, dancing and singing along like no one was watching. He was solely focused on Avril."
Avril closed with her new single Here's To Never Growing Up and thanked the crowd before heading into the crowd to give Chad "big hug and kiss."
As they left the club, the couple stopped to sign autographs, but the source said:"Chad didn't take too many [photos] or sign too many autographs because it was Avril's night and her time to shine. You could tell she appreciated him respecting that."
Avril, 28, and Chad, 38, got together last year when they met to co-write a track for the Sk8er Boi singer's new album, and announced their engagement in August.
They are set to tie the knot this summer.