The singer, 37, who performed at the event with the Capital Children's Choir, sang as thousands of lights were switched on, illuminating the incredible display.
Vanessa Williams, Alexandra Burke and Donna Air were among the stars of showbiz leading the way at the Variety Club Showbusiness Awards on Sunday evening.
The dancer, 35, stunned in a dramatic black dress with daring silver mesh detailing with a thigh-high split as she arrived for the event at The London Cabaret Club.