[custom_adv] Protesters attending the Black Lives Matter demonstration in London were surprised to find themselves rubbing shoulders with Madonna. The singer was in attendance to show her solidarity with the movement following the death of George Floyd while in police custody in the US. [custom_adv] The legendary singer, 61, joined the protest in London on Saturday while battling a knee injury that she's been suffering with since her tour in October last year. [custom_adv] Alexa Chung and Suki Waterhouse also took to their respective Instagram accounts as they joined British-based protesters following George Floyd's killing in police custody, which has sparked worldwide demonstrations since late last month. [custom_adv] Ex-police officer Derek Chauvin has been charged with second-degree murder and second-degree manslaughter after a video surfaced of him crushing 46-year-old Floyd's neck with his knee for nearly nine minutes in Minneapolis, Minnesota.