Alexa PenaVega & Derek Hough dance the Tango to Pompeii by Bastille on Dancing With The Stars Switch Up Night - DWTS Season 21 Week 5.\rbr\rbrThe comments for Alexa and Dereks Tango from Anna and Dominic on the fifth week of Season 21 of Dancing with the Stars. Derek Hough News site: .\rbr\rbrThe afterbuzz comments for Alexa and Dereks Tango on the fifth week of Season 21 of Dancing with the stars. On the panel are Suri Serano, Anna Trebunskaya .\rbr\rbrAlexa PenaVega & Derek Hough dance the Tango to Pompeii by Bastille on Dancing With The Stars Switch Up Night! Subscribe: Watch .