Celebrities who go by one name

POSTED: 02:32 PM PDT May 31, 2011    UPDATED: 11:00 PM PST Dec 17, 2015 
Sia

Australian singer Sia, who celebrates her 40th birthday on Dec. 18, is just one of several celebrities who go by one name. In honor of her birthday, take a look at other stars who are too big for a last name.