‘Dancing With the Stars’ 2015: Bindi Irwin, Carlos PenaVega Lead Final Four After Season 21 Semifinals

The final four performed three routines tonight during season 21 semifinals.

— -- The final four contestants on "Dancing With the Stars" each pulled out all the stops for tonight's season 21 semifinals, and with three routines, the pressure was on to perform well enough to make it to next week’s finale.

They all did.

Five stars were to have competed in tonight's show after actress Alexa PenaVega's elimination last week, but that number was whittled down to four when singer/TV host Tamar Braxton dropped out of the competition after finding out that she had blood clots in her lungs.

"On behalf of both of us she loved every moment of it and I wish she were here to say her thank yous but on behalf of both of us it was an incredible season for me," he said. "I’m very blessed to have met Tamar and she's incredible. I wish her all the best."

Based on their judges' scores and viewer votes, Irwin and Carter had been in jeopardy of elimination tonight, however, because Braxton dropped out of the competition, no one was eliminated at the end of the show.

At the end of the night's three rounds, PenaVega and Irwin were tied for the top spot, followed by Skarlatos, and then Carter at the bottom of the leaderboard.

Tonight's top scorers: Bindi Irwin and Carlos PenaVega were tied for first place with 60 points each after their respective three routines. PenaVega earned his high score of the night for his bubbly Charleston trio, while Irwin got a perfect score for her jazz trio routine.

Tonight’s Scores (First dance; dance-off; third dance. Total.)

Bindi Irwin and Derek Hough: 27; 3; 30. Total: 60

Carlos PenaVega and Witney Carson: 28; 3; 29. Total: 60

Alek Skarlatos and Lindsay Arnold: 30; 0; 27. Total: 57

Nick Carter and Sharna Burgess: 24; 0; 30. Total: 54