Maksim Chmerkovskiy is one of the most beloved and controversial Dancing With the Stars pro dancers. But how well do you really know the bad boy of the ballroom?

Uber fans may already know every fact there is to know about Maks, but for those of you without an encyclopaedic knowledge of the pros we've got the deets about him right here.

1. He's from the Ukraine. Maks was born in Odessa, Ukraine. His parents immigrated to the US to give Maks and his brother, fellow DWTS pro Val Chmerkovskiy, better opportunities.

2. He grew up in a mixed religion household. As he explained on Twitter, his mother is Christian, his father is Jewish.

3. He was engaged to fellow DWTS pro Karina Smirnoff. Maks and fellow DWTS pro Karina Smirnoff were engaged in 2008, but broke it off. That ending left bad blood between them.

4. He was on the Ukrainian Bachelor. Maks took part in the Ukrainian version of The Bachelor in 2011; however, he did not find love, and ended up regretting the experience.

5. He's been on 14 Seasons of DWTS. Maks joined DWTS in Season 2, and has taken part in every season since then. He has been in the Top 3 four times, and the Top 4 two times on top of that, but he has yet to win.

Source: Maksimchmerkovskiy.com, @MaksinC