LOS ANGELES (MSN): Justin Timberlake has allegedly got a secret hair straightener habit. The actor-and-singer reportedly feels embarrassed about the curly locks he sported in his boyband days. Sources revealed that contrary to Justin’s previous explanation about his newly-straightened hair being the result of ‘a hairdryer’, he is in fact using the straightening appliances on a daily basis to perfect his crop. ‘Justin associates curly hair with his *NSYNC days,’ a source told British magazine Heat. ‘And [he] thinks it makes him look stupid.