Frankie Muniz, Nick Lachey, a Property Brother, and Barbara from Shark Tank top the list.
Where have you seen them before? 98 Degrees and all over your TV.
Dancing partner: Peta Murgatroyd
Jason Merritt / Getty Images
Dia Dipasupil / Getty Images
Where have you seen them before? Malcolm in the Middle
Dancing partner: Witney Carson
Frederick M. Brown / Getty Images
Where have you seen them before? 1/2 of the Bella Twins of WWE and Total Divas fame. She's also John Cena's fiancé.
Dancing partner: Artem Chigvintsev
Matt Winkelmeyer / Getty Images