Amy Winehouse arrives at Westminster Magistrates Court, in west London...

British singer Amy Winehouse (R) sucks her thumb as she arrives with her father Mitch, at Westminster Magistrates Court, in west London, on March 17, 2009. Troubled singer Amy Winehouse pleaded not guilty Tuesday to assaulting a woman at a charity ball last year -- and appeared in sunnier form than in recent times

British singer Amy Winehouse arrives at Westminster Magistrates Court, in west London, on March 17, 2009. Troubled singer Amy Winehouse pleaded not guilty Tuesday to assaulting a woman at a charity ball last year -- and appeared in sunnier form than in recent times.