"It wasn't planned, but when it happened, I thought, 'This is perfect. I'm ready to be a mom,'" Trebunskaya told Us. "This is something really good for me and fulfilling, and it'll give me a whole new meaning in life. I'm really looking forward to it."
Trebunskaya announced her divorce from her husband of nine years, professional ballroom dancer Jonathan Roberts, last October and has decided not to reveal the identity of her child's father.
The dancer, who first moved to the U.S. at 17 years old, said that she discovered that she was pregnant when the last season of Dancing with the Stars ended in May.
"It was interesting because in the last six to eight months, I was saying to my friends, 'I'm ready for a change. I feel a change coming on,'" she said. "And sure enough, this is going to be one huge change!"
Trebunskaya has competed on a total of 10 season of Dancing with the Stars, beginning with Season 2 in 2006, in which she partnered with former NFL great Jerry Rice.
She has twice finished as runner-up on the show, with Rice and with figure skater Evan Lysacek, and has yet to win the show.