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02/18/2014 at 06:32 PM ET

Francis Tulk-Hart for Nexxus

When we think of smokin hot Hollywood blondes, Molly Sims ranks high on the list. But the model, actress and jewelry designer just underwent a major hair transformation, trading her signature blonde locks for a fiery red hue. And by just underwent, we mean that Sims literally had the mane change a few hours ago; we were there, and we have the exclusive first images of the stars sexy new look.

So what inspired the dramatic makeover? I wanted to be vibrant, and I wanted a change, Sims tells PEOPLE. I wanted to do something bold. I thought about cutting my hair, but then I was like, Everyone is cutting their hair! I wanted to do something different and to look different in clothes.

And yes, Sims is already making a shopping list for outfits to offset her new do. Im excited to wear different colors. I was always doing cream and gold with the blonde. Now it will be nice to wear something black, and the red gives you that color, she says. I think Im going to buy myself a new jacket. A little Helmut Lang, maybe. Its like how a nice a new pair of heels or boots changes how you walk. Hair changes changes how you feel. Its so important for confidence.

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Speaking of confidence, Sims was so ready to make the change, she only gave her husband a heads up. He was like Are you sure? And I was like, Either that or Im going to to cut it. So he voted for the color. Regardless, hes sleeping with a different woman. Shes also curious to see how her son Brooks, 19 months, will react to her new do. I just FaceTimed with him as a blonde, and Im a little concerned he wont know who I am, but hell know me by my voice.

Though were used to seeing her as a blonde, Sims is a natural brunette and she started off her modeling career with black hair. And like any model, shes sported some styles that she regrets. I did this French braid cornrow that was way too tight, she shares. It was maybe good for an island or on vacation, but thats about it. You could see the lines in my scalp. And Im from the South, so of course I permed. I loved putting all those chemicals in my hair.

Francis Tulk-Hart for Nexxus

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PHOTOS: Molly Sims Dyes Her Hair Red! She Dishes to PEOPLE Exclusively About Her New Do