0710_bielJessica Biel and Justin Timberlake are notoriously private when it comes to their personal lives -- but Biel is opening up like never before in the new issue of InStyle.

The actress, who can be seen this summer in "Total Recall," talks candidly about the gorgeous square-cut diamond engagement ring he got her ... and reveals how he helps her plan her outfits.

"I had no say whatsoever [in the ring]. I don't micromanage," she in the August issue. "He is fearless in his choices and has a real eye for design. And I'll be honest: He has better taste than I do."

She continues, "When I walk out of the closet after getting dressed in the morning, I'll go like this [turns palms upward as if to say, 'Well?'] And he goes like this [shakes his head no]. Then he picks again. It's hilarious."

While the two haven't said "I do" yet, Biel is definitely thinking towards the future -- and says she'd love to raise kids in Colorado, where she grew up.

"I would like those future little people to have the experience I had, in some capacity," she says. "It was fun. I love Colorado; I've always thought that could be a possibility for me."

Of Justin she also adds, "It is important to me to have a partner who is loving and fun – someone who inspires me. And he must be a good person."

See more from Jessica when the August issue of InStyle hits newsstands on Friday.

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