Mariah Carey flew in from the US to perform at the star-studded reception in London.
Alicia Keys has said that her forthcoming album will include "the best music I've done in my life yet".
Alicia Keys, who is currently expecting her second child with producer and rapper Swizz Beatz, said that the album is "pretty much done".
Speaking to Billboard , the singer said: "What I know for a fact is it's the best music I've ever done in my life yet, and it's really exciting to be able to have this kind of growth, this type of opportunity,"
"The music's actually pretty much done already, and so you'll be hearing some of it soon."
Keys's last studio album Girl On Fire was released back in 2012 and reached number 15 in the UK.
Watch the music video for Alicia Keys' ‘Fallin’’ below: