The Dancing with the Stars professional announced her engagement to professional baseball player Penny in November 2010.
However, she later postponed the wedding in October 2011, claiming that her long hours on Dancing with the Stars left no time to plan the ceremony.
Smirnoff was quoted as saying: "I want to enjoy this and I want to enjoy the wedding and doing it together is just really hard. Once [Dancing with the Stars] is over, we're going to concentrate on the rest of the life."
According to US Weekly, the pair have now ended their relationship for good.
No details about the split have been revealed and reps for Smirnoff have not commented on the reports.
Smirnoff said in March that she and Penny were planning a destination wedding and hoped to tie the knot in the near future.