The couple reportedly started off as friends when they met through a mutual friend about six months ago. Dating rumors then began to swirl in June when their relationship had reportedly taken a turn towards "serious" following a romantic dinner date for Upton's 21st birthday in New York on June 10.
"We have an incredible time together, and, you know, I definitely didn't see that coming and I think neither did she. We enjoy each other's company very much and like I said, she's a great girl that I never thought anything romantic like this could have happened," Chmerkovskiy said.
Neither Chmerkovskiy or Upton owned up to their romance until now. The pair had even stepped out holding hands in public in September without directly confirming their relationship, which quickly prompted a source to tell People that Chmerkovskiy, 33, and Upton are definitely an item.
"Things are going great... I think I got lucky... she's an amazing girl," Chmerkovskiy toldExtra. "Everyone is happy, we are enjoying each other's company."
The dancing pro also acknowledged recent reports Upton just got an apartment near him.
"I live in New Jersey, she got an apartment in Manhattan," Chmerkovskiy confirmed.
Brother Val Chmerkovskiy also told Us his thoughts on Upton while at a launch for his new line, Valentin Clothing, in Beverly Hills on Thursday with Maksim.
"I think she's awesome," Val noted. "She's a great girl, and we're great friends. She's an incredible chick and we have a great time."