No, not really. Though Simon Cowell is reportedly holding back on letting Leona Lewis embark on a world tour because he doesn't feel she is confident enough to stand up and sing in front of thousands of people.
A source told The Sun: "Although Simon believes in Leona as a world-class solo singer, he still feels she does not have enough confidence to play to large crowds on her own. There is certainly a real art to getting the audience in the palm of your hand as entertainers as Mariah, Robbie Williams and Elton John can do. Leona is Simon's little baby and he is very aware of how shy she is".