Kelly Osbourne has reappeared on social media after a three-month silence to mark two very special occasions – her 37th birthday and being five months sober.READ: Kelly Osbourne hits out at 'stupid rumours' in candid new videoThe daughter of Ozzy and Sharon Osbourne shared two pictures with her 2.4 million fans, one showing her posing with her mouth-watering strawberry cake and another photo screengrabbed from her Twelve-Step programme which showed her progress.WATCH: Kelly Osbourne admits to