Jessie J sings duet with will.i.am during Diamond Jubilee Concert British singer-songwriter Jessie J (R) sings a duet with US singer-songw...

Jessie J sings duet with will.i.am during Diamond Jubilee Concert

British singer-songwriter Jessie J (R) sings a duet with US singer-songwriter will.i.am (L) during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

British singer-songwriter Jessie J sings a duet with US singer-songwriter will.i.am during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.