Actress/wildlife conservationist Bindi Irwin and dancer/TV personality Derek Hough attend "Dancing with the Stars" Season 21 at CBS Televison City on Nov. 9, 2015, in Los Angeles. David Livingston/Getty Images

Audience members held their breath during the Season 21 semifinals of ABC's “Dancing With the Stars,” as the show’s co-hosts, Tom Bergeron and Erin Andrews, revealed which couples would be competing in the anticipated 2015 finale. Alek Skarlatos and Lindsay Arnold were the first twosome to learn that they were safe from Week 10’s dreaded elimination, followed by Carlos PenaVega and Witney Carson.

That meant Nick Carter and Sharna Burgess, along with the fan favorite couple Bindi Irwin and Derek Hough, received the lowest combined scores and viewer votes, putting them on the ballroom chopping block.

Both Bindi and Nick looked fearful as their fate on the show hung off Tom’s lips. However, the two learned at the very last moment that both of them would have the chance to win the coveted Mirror Ball Trophy due to Tamar Braxton’s sudden withdrawal.

“As regular viewers know, when someone withdraws we eliminate no one. So you’re both dancing in the finale!” Tom told the two couples who were relieved -- and a bit shocked -- to hear the good news.

On Tuesday, Tamar revealed that she was forfeiting from “DWTS” after she learned that she doesn’t have pneumonia “but something way more serious.”

The songstress’ partner, Val Chmerkovskiy, explained during the Monday night installment that his partner is suffering from multiple blood clots in her lungs. “And if [they] go to your heart ... you die,” he grimly noted, adding that her blood clots may have formed due to her hectic traveling schedule. “What happens is, flying apparently causes swelling in the ankles, which causes blood clots,” Val revealed, stating that his partner, who is still undergoing treatment, loved “every moment” she spent on the ballroom floor. “It was an incredible season.”

Were you surprised to learn that all four couples will be competing during the Season 21 finale of “Dancing With the Stars”? Who do you think will win the Mirror Ball trophy? Sound off in the comments section below and don’t forget to tune in to “Dancing With the Stars” next Monday at 8 p.m. EST and Tuesday at 9 p.m. EST on ABC.