Jennifer Garner: Nothing Compares to the Day When You Marry the Man of Your Dreams

What a stunner! Jennifer Garner looked incredible at the world premiere of her latest movie Alexander and the Terrible, Horrible, No Good, Very Bad Day last night at the El Capitan Theatre in Hollywood, Calif., wearing a flirty Valentino frock that she teamed with matching ankle-strap Jimmy Choo pumps and an assortment of dazzling Neil Lane jewels.

The actress stars alongside Steve Carell in the upcoming Disney flick (in theaters Oct. 10) that centers on a family's worst day ever, but in real life our October cover star prefers to focus on the positive. "I've had so many good days," Garner tells InStyle. "You can't really compare anything to the days when you have babies. You can't compare anything to the day when you get married to the man of your dreams. They're just too big."

Jennifer Garner On Her Best Day Ever

You can't compare anything to the day when you get married to the man of your dreams. —Jen Garner

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Clearly, her husband, Ben Affleck, and children, Violet, 8, Seraphina, 5, and Samuel, 2, are number one on the actress' priority list, but that doesn't mean its all happy times in their household. "There's days when the kids are nuts. Sometimes there are things that just happen, and all you can do is just put everyone to bed and have ice cream—hope for a better day tomorrow," she shares. "The other day, everyone was cranky, and I turned on really loud music and gave everyone cymbals and drums and we had a marching band."

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—With reporting by Brianna Deutsch