At least X Factor Nicole recognised the PM this time She may have admitted her embarrassment at only recently finding out who he is but that didn't stand in the way of X Factor judge Nicole Scherzinger, who visited Prime Minister David Cameron at Number 10 yesterday. The pair - with finalists James Arthur, Jahmene Douglas and Christopher Maloney - met to turn on the lights of the Downing Street Christmas tree. The singer, who posed for photographs with Mr Cameron beside the tree, grown by Mike Craig on his farm in Dumfries, in Scotland, last month admitted to reporters that she had asked one of Mr Cameron's aides where Tony Blair was. I didn't know who he was. They said they were introducing me to the Prime Minister and he came over, and I was like, 'Where's Tony Blair?' I thought it was still him. Someone had to tell me. I was a real ass," Ms Scherzinger told the Daily Mirror at the time.