Jenna Dewan is an actress.
Jenna Dewan Tatum ( [ də ` wɑːn _ ` teɪtəm ] born Jenna Lee Dewan ; December 3 , 1980 ) is an American actress and dancer . She is known for her role as Nora in the 2006 film Step Up . Step Up (film) . Set in Baltimore , Maryland , the film follows the tale of the disadvantaged Tyler Gage ( Channing Tatum ) and the privileged modern dancer Nora Clark ( Jenna Dewan ) , who find themselves paired up in a showcase that determines both of their futures .