Kelly Osbourne looked gorgeous as she stepped out in a black top and floral skirt after revealing she had a "gastric sleeve" surgery to lose weight.The 35 year old, who has lost a whopping six stone partially thanks to her vegan diet, was photographed wearing a black shirt with only a few buttons done up, offering fans a glimpse at her midriff.The star tucked the shirt into a calf-length beige-themed multicoloured floral skirt, which also highlighted her slim legs.