Justin Bieber has been teaching Kelly Osbourne how to spray paint graffiti.The 'Fashion Police' host enjoyed a ''random'' night with the 'Believe' hitmaker, which involved him teaching her how to create street art, but she struggled with the skill. After the pair created a cartoon tortoise with a halo and golden horns, Kelly took to Twitter to share her experience, tweeting: ''Just had so much fun getting lessons from @justinbieber on how to #SprayPaint! Needless to say I was s**t all I did was the horns! Justin is a lovely boy and have turned me into a true #Belieber tonight! ''Most #Random but fun night with @justinbieber! (sic)'' A ''random'' night of fun with Justin could be just what Kelly needed as she announced yesterday (08.01.13) that she and Matthew Mosshart have called off their engagement. A spokesperson for the 29-year-old star said: ''Kelly Osbourne and Matthew Mosshart have decided to end their engagement. The split is amicable and the pair continue to have nothing but the utmost respect for one another. Kelly is looking forward to a new year full of fresh beginnings. No further comments will be provided by all parties and we request privacy, decorum and space from the press but don't expect it.''