The 'Sk8er Boi' hit-maker visited Mattel Children's Hospital at UCLA and toured the wards meeting with sick children before putting on an impromptu performance with them, reported Starpulse online.
She returned last week and brought some musical cheer by presenting the youngsters with instruments to learn while they recover.
The 27-year-old singer and her musician pal Evan Taubenfeld helped teach their young proteges the basics, with Lavigne taking to Twitter to write, "EvanT giving impromptu guitar lesson (at) UCLA Health Mattel Children's! We just donated instruments to them!
"THANK YOU EvanT for helping The Avril Foundation donate instruments (at) UCLA Health Mattel Children's!"
