A fellow guest filmed the star as he evacuated down the hotel’s fire steps.
It comes as more than 100 firefighters battled the fire at a luxury five-star hotel just metres from Harrods in central London.
Twenty fire engines were sent to the Mandarin Oriental Hotel in the exclusive Knightsbridge neighbourhood, The Sun reports.
Pictures and videos posted on Twitter show large plumes of thick black smoke billowing from the posh hotel near Hyde Park.
London Fire Brigade said crews raced to the scene at 3.55pm (12.55am AEST) after dozens of calls from concerned members of the public.
A massive fire has broken out at the Mandarin Oriental Hotel in London. Picture: MEGASource:Mega
Dozens of guests have been evacuated from the historic hotel while crews tackle the huge roof fire.
The Sloane Street entrance to Knightsbridge has been closed and customers are being advised to use the Harrods entrance.
LFB said in a statement: “We’ve now got 20 fire engines and around 120 firefighters and officers tackling a fire on the roof of a hotel in Knightsbridge.
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