Justin Bieber had a busy day - he then went to delight sick kids as part of a special meet-and-greet set up by organisers at the Make-A-Wish Foundation charity.


Taking to his Twitter.com page after the event, he wrote, "MakeAWish thanks for having me. best part of the job. Everyone follow them as they r (sic) an inspiration."


The singer also reportedly managed to fit in a doctor's appointment and submit to a DNA test on Friday to disprove allegations he fathered a child with California woman Mariah Yeater.