"You know, everybody goes through ups and downs in their relationships," Smirnoff told Usmagazine.com by phone Tuesday. "That's kind of a given and it's normal. But Mario and I are going strong."
Smirnoff went on to call Lopez "a great guy."
"I support him 100 percent and I know he supports me. We are totally fine -- and I'm not moving out!" she told Usmagazine.com. "You guys will be the first to know if I'm moving out."
The couple met on the third season of the TV dance competition show "Dancing with the Stars."
Lopez is currently appearing in the Broadway musical "A Chorus Line."