Osbourne took to Instagram on Thursday (23Jul15) to remember her fellow Brit, confessing the world is "boring" without her old friend, who passed away, aged 27, in 2011.

Posting a photo of herself and the Rehab hitmaker enjoying a joke, she added the caption, "I can't believe it's been four years since I lost my #Lul. The world is a boring place without Amy... Not a day goes by where I don't miss my black butterfly!"