‘Dancing With the Stars’ Season 21 Cast: Week 4 Remaining Contestants

'Dancing With The Stars' Season 21 Cast - Week 4

On tonight's episode of Dancing With the Stars, Alfonso Ribeiro will be stepping in for Tom Bergeron and acting as co-host to Erin Andrews as Bergeron has a family emergency. Tom Bergeron announced via Twitter that his father is ill and he's flying out to be by his side. For more information on Bergeron's sick father, click here. In addition, thousands of DWTS fans were hoping that Kim Zolciak-Biermann would be allowed back on the show though she was disqualified after suffering a stroke. Unfortunately, she will not be returning until the finale. In some other big news, pro Witney Carson got engaged to her longtime boyfriend over the weekend. As far as who is performing on tonight's show, click through our gallery to check out the performers. (ABC/DWTS)