Maksim Chmerkovskiy Talks About Breakup with Karina Smirnoff

Maksim Chmerkovskiy talks to ET about his breakup with fellow "Dancing with the Stars" pro Karina Smirnoff.

The upbeat dancer takes a somber tone when talking about the breakup, saying, "Thank God for this season, because all my attention goes to Debi [Mazar]" -- his celebrity partner on "DWTS."

"This is probably the most serious I've ever taken a season, in light of everything that's happened," he adds. "This is what I want to focus all my attention on."