On the Zhenya Kanaeva Rhythmic blog I saw this interesting article about Olympic and World Champion Yevgeniya Kanayeva.
Interview translation: Kanaeva: I’m not leaving in the near future
She and Maria Petrova are the only two Rhythmic gymnasts who won titles at 3 consecutive Worlds. Kanaeva has 17 world championships Gold medals.
Gymnastics Coaching.com 