Biel, 30, tells InStyle in its August cover story that Timberlake, 31, helps choose her outfits – and picked out her gorgeous engagement ring without any input from her.
"I had no say whatsoever [in the ring]. I don't micromanage," she tells InStyle, on newsstands Friday. "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."
Adds Biel, "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."
Fashion feedback aside, Biel says her advice for having a happy relationship is "letting go of the little stuff. You can't let it get to you." Plus, being with an inspiring person is key to her happiness. "It is important to me to have a partner who is loving and fun – someone who inspires me," she says. "And he must be a good person."
Asked about whether she plans to raise children someday in Los Angeles, where she and Timberlake currently live in the Hollywood Hills, the actress who was raised in Colorado says, "I would like those future little people to have the experience I had, in some capacity. It was fun. I love Colorado; I've always thought that could be a possibility for me."
Making Time for Each OtherIn addition to being raised in the outdoorsy environment of her home state, Biel says she learned a lot about relationships growing up by watching her mom and dad.
"The best thing I learned from [my parents] is that you have to put your relationship first. You need to make time for your partner," she says. It's really easy to let that go by the wayside. It's easy to say, 'Hey, I'll see you later. I love you.' And you can't do that."
Biel finds this especially difficult because of the demanding schedules she and Timberlake have because of their work. "Justin and I have a rule that we don't let a certain amount of time go by without seeing each other, but it doesn't always work," she says. "But from here on out, I want to participate in making smart choices for the relationship."
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"In my earlier experiences with relationships, I was really vulnerable to somebody else's personality, hobbies and way of life," she says.
"But as I've gotten older, I've become proud of the traits that make me who I am. Maintaining my individuality is really important to me because otherwise I can easily slip into somebody else's life. So I'm glad I'm getting better at it. It's a process, but it's getting simpler."