It's time to hit the road! After a tough round of judging and tearful goodbyes, the final four couples – Bri and Chris, Jamie and Trevor, Rudi and Matt, and Natascha and Ryan – take their relationships and performing talents to Las Vegas, traveling by luxury tour buses. Chris and Bri serenade a happy couple at their wedding. Jamie and Trevor use an empty arena as a backdrop to share their feelings for one another. Rudi and Matt are invited onstage by Reggae and dancehall icon Shaggy to sing backup on one of his hits. Natascha and Ryan let off steam by using heavy construction equipment to crush cars. The couples perform for this week's panel of judges, including Arie and Lauren Luyendyk Jr., music power couple Ashlee Simpson-Ross and Evan Ross, and Train front man, Pat Monahan, who decide who will move on to the finals and have their romantic and musical dreams come true.