Two former X Factor stars here... although one of them is better known as a judge! This image appears in the gallery:Summertime Ball 2014 Line-Up: Face Mashup Quiz 11. Two former X Factor stars here... although one of them is better known as a judge! Click next for the answer... Pictures: PA 20 images See the full gallery: Summertime Ball 2014 Line-Up: Face Mashup Quiz