Been wondering this for a while. Women who do ballet are called
Ballerina's. Are men called the same thing or something else?

Hi! Thanks for an interesting question.

According to the online ballet dictionary of the American Ballet
Theatre and other websites, a male ballet dancer is called a
"cavalier".

"Cavalier - The male partner of the ballerina"

American Ballet Theatre: Ballet Dictionary
http://www.abt.org/education/dictionary/index.html

"Cavalier"
http://www.webref.org/dance/c/cavalier.htm

"Ballet Terms"
http://www.geocities.com/Vienna/Strasse/5503/ballettermsa-d.html

Search terms used:               
ballet glossary cavalier male
      
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Thanks for the fast precise answer!

An alternate term is "danseur noble":

"The Danseur noble is the male equivalent of a ballerina."

http://www.fwdballet.com/kids/index.asp?ID=0203

"danseur noble

 n : a male ballet dancer who is the partner of a ballerina" 

http://dictionary.reference.com/search?q=danseur+noble&r=3