PHOTOS: Renée Zellweger's Continuously Changing Looks

There’s something different about Renée Zellweger — and it has nothing to do with gaining weight for another “Bridget Jones” revival. READ: Renée Zellweger is Almost Unrecognizable These Days All eyes were on the 45-year-old actress at Monday evening's Elle Women in Hollywood Awards at the Four Seasons Hotel in Los Angeles — but perhaps for the wrong reasons: Zellweger was definitely missing her signature squint and permanently pursed lips. What happened? Back in 2013, the Oscar-winning actress stirred headlines for her dramatic transformation, which the Daily Mail characterized as a “deer-caught-in-the-headlights gaze.” PHOTOS: 10 Celebrities That Look Way Older Than They Actually Are There are several reasons why Zellweger, who E! Online describes as “one of the highest-paid actresses in Hollywood just years ago,” looks different these days.  Several media outlets, like The Huffington Post UK and gossip blogger Perez Hilton hinted that maybe she had a little work done. Anthony Youn, M.D., who hasn’t personally treated the star, told Radar he suspected the same. “It appears that she may have undergone injections of Botox, preventing her brows and forehead from creating her trademark look,” says Youn. “Her brows look more relaxed, allowing her eyes to open up more.” READ: The Truth About Botox While Zellweger has never openly admitted to getting surgery, Express UK reports that several life changes, such as “a dramatic weight loss and an embarrassingly short wedding to country singer Kenny Chesne,y” did have an impact on her life, which could have prompted a makeover of sorts.  It could also just be the aging process at work. You be the judge. See Zellweger’s many looks from over the years below, then take our poll on how far you'd go to avoid aging.