Celebrities who go by one name

Published On: May 31 2011 02:32:50 PM PDT   Updated On: Dec 17 2015 11:00:00 PM PST
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.