Robbie Williams was one of the guests evacuated from the Mandarin Oriental Hotel.
The rooftop of the Knightsbridge's hotel spouted smoke as a fire broke out.
"I went on the balcony and looked up and there was just billows and billows of smoke," the singer said.
"‘I came back in from the balcony and said, the hotel’s on fire.”
The next thing the singer knew, the bellboy knocked at the door, telling them to "get out."
In footage obtained by the Daily Mail, Robbie is seen exiting the hotel via the fire escape.
When asked if he was okay, the dad responded with thumbs up.
Firefighters will remain at the scene of the #Knightsbridge hotel fire throughout today. At the height of yesterday's incident, 20 fire engines and 120 firefighters and officers attended the scene https://t.co/Q8RMsTDSTf pic.twitter.com/eGXmhPsa28— London Fire Brigade (@LondonFire) June 7, 2018
The London Fire Brigade said on Twitter, that they will be present throughout the day at the hotel.
The incident was attended to by 20 fire engines and 120 firefighters and officers.
Holly Candy aka Holly Valance was also caught up in the fire.
Taking to Twitter, the Neighbours soap star uploaded a video.
It is understood that the hotel had just finished refurbishments.
Rooms only re-opened to the public last Tuesday, according to reports.
The London Fire Brigade in a statement said the cause of the fire is unknown.