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Perhaps we can blame Renee Zellweger's dramatically different look at last week's Elle Women in Hollywood event to bad makeup?

The 45-year-old Oscar-winning actress stepped out in Mississippi Monday in casual workout clothes, looking more like the Bridget Jones' Diary star we all know and love. Going makeup-free, Renee clearly had nothing to hide in her first appearance since all of the uproar over her supposed new face, looking completely comfortable in a loose sweatshirt, black leggings and purple sneakers.

VIDEO: Renee Zellweger on Her New Appearance

Zellweger herself commented on her headline-making red carpet appearance last Wednesday, explaining that she's actually glad people think she looks different.

"I'm living a different, happy, more fulfilling life, and I'm thrilled that perhaps it shows," she told People. "My friends say that I look peaceful. I am healthy. For a long time I wasn't doing such a good job with that."

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    "People don't know me [as] healthy for a while," she added. "Perhaps I look different. Who doesn't as they get older?! Ha. But I am different. I'm happy."

    But according to Beverly Hills plastic surgeon Dr. Stuart Linder, who spoke to ET to give his expertise on plastic surgery, it's very likely that Zellweger has had several significant procedures done.

    "Renee's transformation is very, very significant," he told ET. "Looking at her eyes, they have dramatically changed from her before pictures from just a couple years ago. The upper eyelids may have undergone [a procedure] where you remove the skin, and I think it's pretty reasonable that she has had this because the positions of her eyebrows have gone down in her current pictures, and the eyelid crease is more prominent. And if you look at her outer eyebrows, called the lateral brow, they've come down as well. And that's also a telltale sign of having skin removed from the upper lids."

    Interestingly enough, in 2002, Zellweger talked to ET about plastic surgery, stating that it didn't "interest" her.

    "Creatively I don't want to worry about if my nose is runny or if it's red or if it's shiny," she explained. “I'm in a crying [scene], if there is a moment where I'm expressing something that is really emotional and I'm crying, I don't care. Because you know what happens when people cry? Their noses get red and shiny and they run and that's beautiful. Don't change it! Don't get rid of that because that's not pretty."

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