Amy Adams dazzled old Hollywood style on Monday night at the Los Angeles premiere of The Fighter. The new mom showed off her post-preggers bod in a delightful pale grey J. Mendel Grecian style gown, which perfectly complimented her skin tone.  Paired with red satin heels and lipstick, as well as a pair of Irit Design oxidized sterling silver pave diamond and Tahitian pearl earrings with a matching Irit Design oxidized sterling silver pave diamond ring, the big screen babe was dressed for success!

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While Brad Pitt was as dapper as can be in Burberry and Angelina Jolie looked wondrous in Atelier Versace winter white, fashion designer Betsey Johnson brought the wacky factor to the New York premiere, wearing a nightmarish look from the Spring 2010 Alexander McQueen collection.

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Over in Las Vegas, Carrie Underwood radiated in a red Georges Chakra gown and gold Rene Caovilla sandals at the American Country Awards.

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At the Los Angels premiere of The Tempest, Katy Perry supported her hubby Russell Brand, looking demure in a pale lavender Elie Saab Couture gown at the Los Angeles premiere of The Tempest, while Helen Mirren dazzled in a navy blue sequin top and luxe matching skirt.

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Lady Gaga had a complete fashion fur pas in Milan, wearing an overbearing multi-colored coat.

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Who else rocked and shocked on the fashion front?  Find out in RadarOnline.com's daily photo feature!