It is the final countdown on "dancing with the stars." The pressure is intense. Just three couples left standing ahead of tonight's blockbuster finale. Bill engvall and emma slater, you were sent home on monday night. And melissa rycroft talked to them about their improbable run. Reporter: The countdown is on, to see who will be taking home the mirrorball trophy. Everybody is dancing with heightened anxiety tonight. Reporter: Emotions, running high on the dance floor. As the last four couples edge closer to the prize. Corbin bleu, channeling the king OF POP FOR A PERFECT THREE 10s. And amber riley, lighting up the ballroom with her charleston. That was so high-voltage, there is a power surge across the country. &#9834; Reporter: And jack osbourne showing how far he's come, despite the many challenges in his way. That was a true show-stopper. There you go. He shaved his chest. Reporter: You did? You shaved it for this. I thought you were a baldy. We know that's not right. Reporter: You should spray paint on it. We were going to. Reporter: Despite bill engvall's viewer popularity, he's hanging up his dancing shoes. I will never forget this. Reporter: The show is so much more than dancing. It really is. You come up with team spirit. It's like you guys against the world. It's something I'll look back on when I'm 80 years old and go, that was cool. Reporter: Hours away from crowning a season 17 champion. So, who will it be? For "good morning america," melissa rycroft, abc news, los angeles. Everybody's doing such a great job. And be sure to watch the finale of "dancing with the stars" tonight at 9:00, 8:00 central here on abc. All four couples will be right here in times square tomorrow morning for our "dancing with the stars" after-party. And we want you to tell us which star you think will take home that mirrorball trophy. Cast your vote on goodmorningamerica.Com on yahoo!