Justin Bieber visited a young fan who is battling leukaemia ahead of his concert in Utah last night (January 5).

Right before his Salt Lake City show on Saturday night, the Canadian superstar stopped by Primary Children’s Medical Center to meet with seven-year-old fan Millie Flamm, who’s been battling leukaemia for the past three years.

An online campaign was started after the young girl was too ill to attend Bieber's concert, with her dad Brad Flamm, telling the local ABC station, “A friend posted a picture on Facebook, and it’s been shared thousands of times.”

A number of fans took to Twitter to share their delight at Justin's kind gesture.

While one wrote: "I'm so happy Justin went to visit Millie!! :)" another fan wrote: "Millie met Justin in the Medical Center before his show.He put a smile on her little face ♥ (sic)."

Bieber's show comes just days after photographs surfaced of him reportedly smoking marijuana with friends in a hotel room.

The teenage heartthrob took to Twitter yesterday to share his thoughts amidst the scandal surrounding him: ''Everyday growing and learning. Trying to be better. U get knocked down, u get up. I see all of u. I hear all of u. I never want to let any of you down. I love u.

He added: ''I'm ready. We are ready. See u all tomorrow and everyday after that. Back on tour tomorrow. Ready to see u all smile. Time to do what I'm supposed to be doing. Performing (sic).''

Watch a recent interview with Justin Bieber here: