Former 'X Factor' star Cher Lloyd has admitted she was a "nightmare to work with". But the 'Want You Back' singer now insists she has toned down her diva ways and is no longer a stroppy teenager. She tells MTV that she had been difficult but says that she has changed: "I was a nightmare to work with. I was 16 years old and I wanted everything my way. Cher Lloyd "What I didn't understand that ...