Ready for your jaw to hit the floor? Check out this video EIC Kate Lydon found. Holy balances, Batman!
The "baby ballerina" with the unbelievable technique is Joyce Cuoco, who became famous at a very young age performing with Boston Ballet. She appeared on the Ed Sullivan show in 1966; this video is probably from about that time (actually, it might be the Ed Sullivan performance—if anyone knows for sure, please tell us in the comments!). Later on, Cuoco performed at Radio City Music Hall and with the Stuttgart Ballet. If Wikipedia has it right, today she's the assistant to choreographer Youri Vámos and the director of a ballet school in Düsseldorf, Germany. What a phenomenal talent!