On Dancing With the Stars Season 18, Week 4, Amy Purdy was paired with Mark Ballas for the Switch Up challenge. They had a Salsa.

In the video it was clear Amy was glad to get Mark, who is Derek's good buddy. Amy said she felt like she's leading Mark. Mark said working with Amy is the biggest challenge he's had on this show. He had to pow-wow with Derek. It sounds like they worked it out. According to Amy it got better each day, and she wants to bring it.

Amy was hot, hot, hot in this Salsa. Amy has great hit action. Go girl!

Julianne said Amy is a fierce competitor, and did an amazing job. Bruno said she continues to astonish him. She did incredible footwork, she did everything right. Carrie Ann loved it. Len said it was full of rhythm, and her bottom is the top.

Score: 34/40.

Dancing With the Stars airs on Mondays at 8 p.m. ET/PT on ABC.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google.