Doctors caring for an Ottawa woman who generated star support for organ donation say the 21-year-old is doing well after her double-lung transplant.

Helene Campbell -- who was diagnosed with advanced idiopathic pulmonary fibrosis last October -- received a transplant at Toronto General Hospital earlier this month.

Dr. Tom Waddell led the 10-member team in performing the transplant and says Campbell spent her first full night without a ventilator on Monday.

He says Campbell is walking on a treadmill, sitting up in a chair and doing special breathing exercises.

Campbell was propelled into the spotlight after pop superstar Justin Bieber endorsed her organ donation awareness campaign.

She later appeared on Ellen DeGeneres' daytime talk show via Skype and has been invited to return in person once she recovers.