Claim: Jenna Dewan is an actress.

Jenna Dewan Tatum -LRB- -LSB- də ` wɑːn _ ` teɪtəm -RSB- born Jenna Lee Dewan ; December 3 , 1980 -RRB- is an American actress and dancer . She began her career as a backup dancer for Janet Jackson , and later worked with artists including Pink , Missy Elliott , and Christina Aguilera . She is known for her role as Nora in the 2006 film Step Up . She has also starred on the short-lived NBC series The Playboy Club and had a recurring role on the FX series American Horror Story : Asylum . She was Freya Beauchamp on the Lifetime series Witches of East End and as of 2016 was playing the recurring role of Lucy Lane in Supergirl .