"I'm not someone who has this amazing instinct about fashion. Sometimes I cannot be bothered... I just throw on whatever is comfortable," she admits in the July issue of Glamour, which hits newsstands June 8. "Other days I will torture myself -- do I want to do funky and cool, or feminine?"
That's not to say that the actress -- who claims she "literally spent most of my teenage years in Umbro shorts and No Fear T-shirts" -- doesn't enjoy shopping.
Biel, who wore a Dsquared2 top and Versace skirt for her Matthias Vriens-McGrath cover shoot and J Brand jeans and Roger Vivier flats during her interview, says she loves a good sale, but, "I never know when they are! I always hear about the Barneys sale like two days after it's over."
One date she won't forget is June 11, when her blockbuster action film, "The A-Team," hits theaters. Biel, 28, describes her character, Charisa Sosa, as "a hard-core adrenaline junkie... I'm also an adrenaline junkie," she tells Glamour. "I'm a romantic adrenaline junkie!"
But while the star is reluctant to reveal details about her relationship with singer Justin Timberlake, she happily shares the secret behind her killer body. "I like to do a couple of yoga classes during the week, mixed in with weight training sessions for strength," says buff Biel, who climbed Mount Kilimanjaro in January.
"When you get out into the wilderness and strip [away] all of the stuff in your everyday life, you really gain a great respect for your own life, simply as it is. Needing things starts to feel like, 'Oh, I kind of have everything, don't I?"
Yes. Yes, you do, Jessica. And if you weren't so sweet, StyleList would hate you for it.
In related news, Milla Jovovich also loves a good bargain.