CNN : Why did you choose to do something animated ? Jessica Biel : I think I chose this part because I 'm kind of a kid at heart and I really thought the story was so sweet and fun . ... I was n't doing anything . I was able to work in town , at home in L.A. , which is so rare . CNN : You could probably wear your pajamas to work . Biel : Pretty much . Roll in , no hair and makeup . I just always wanted to be a voice in some great movie where some little girl loves my character . CNN : Did you get to meet -LSB- your co-stars -RSB- when you were doing the voices ? Biel : I never saw them , never met them . I mean , I know Dwayne , I 've known Dwayne for a long time . I met Justin before , but I never saw them once . It was such an interesting experience to be there by yourself kind of going through it . But ... it goes fast . You 're there , it 's fast , it 's
Los Angeles , California -LRB- CNN -RRB- -- There 's an innocence to Jessica Biel , she says . The actress , who has starred in `` The Illusionist '' and `` I Now Pronounce You Chuck and Larry , '' wanted to tap into her childlike side for `` Planet 51 , '' a new animated film about an Earth astronaut who lands on a faraway planet that has much in common with 1950s America -- except for the aliens . `` I love that kind of throwback to a more of innocent time and a simpler time and more conservative , '' she told CNN . `` There 's something just kind of attractive about that , those kinds of qualities to me , and I just thought it would be fun . '' `` Planet 51 , '' which also features the voice work of Dwayne `` The Rock '' Johnson , Justin Long and Gary Oldman , opens Friday . Biel sat down with CNN to talk about the film , the challenges of voice work and the difficulty of finding good roles for actresses . The following is an edited version of the interview .