(Cover) - EN Star Style - Jessica Biel is freaked out by the idea of ageing.

The 28-year-old actress is famous for her toned body, which is part of the reason she is often mentioned in lists of the sexiest women alive. Although Jessica doesnt enjoy being judged solely on her looks, she admits the idea they will fade at some point terrifies her.

Im freaked out by the idea my body will age and I cant control it. You suddenly look different, but you still feel 20 years old, she mused. I love the idea of gaining weight for a role, though, like Rene Zellweger in Bridget Jones Diary. Doing that to your body is a huge challenge. Maybe Ill try it one day!

Jessica insists there is no secret to the way she keeps in shape. She works out and eats healthily, explaining it helps that she actually enjoys exercise.

I love being active. I work out three to four days a week - I do yoga, go for a run, walk my three dogs, she told InStyle. If I dont, I really have low energy and feel emotionally heavy. (C) Cover Media