Pop superstar Madonna has expressed her grief following the death of her close friend, Irish interior designer David Collins. The 58 year old, who designed interiors for many high end fashion boutiques and luxury department stores, passed away on Wednesday (17Jul13), just three weeks after he was diagnosed with an aggressive form of skin cancer. Madonna was left heartbroken by the news, and she posted a tribute on her Instagram page in memory of her pal. She uploaded a picture of pink roses with the message, "In memory of David Collins. He was a great talent and A good and loyal friend for 17 years! god bless him and may he R.I. P." Madonna was spotted flying into London's Heathrow Airport two days after Collins' death wearing a sober black outfit, and she is expected to be among the mourners at his funeral in Ireland this week (beg22Jul12).