Madonna is riddled with grief following the death of one of her closest friends.

The 54-year-old Material Girl was seen dressed from head to toe in black at London’s Heathrow airport on Friday.

Madonna flew into town to attend the funeral of her dear pal David Collins. The famed interior designer worked on famous London hotel Claridge’s and he also designed a number of Madonna’s homes.

David perished on Wednesday at the age of 58 after being diagnosed with skin cancer less than a month ago.

Apparently Madonna is overcome with sorrow right now.

“Madonna is beside herself with grief,” a source told British newspaper The Sun.

“David was one of her closest pals for years – she adored him.”

It is rumoured that Madonna is still caught up in the shock of how swiftly her friend died.

David’s death seemed to have come too soon for the star.

“They’d often have a laugh around London, driving around together,” the insider detailed.

“She can’t believe he died just three weeks after his diagnosis.”

Madonna acknowledged the passing of David on her Instagram account.

She posted a photograph of red roses along with a caption that read, “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 RIP.”

It is thought Madonna will be heading to David’s native Ireland for his funeral in Dublin within the next week.