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Reese Witherspoon hit the gym in Brentwood on Thursday afternoon, and the Oscar winner showed off her massive platinum wedding band when we caught her returning to her car. This will certainly go nicely with the 4-carat diamond engagement ring Jim Toth gave her last December...

This is the first time we've seen Reese since she tied the knot last weekend at her Ojai estate, and after a quickie honeymoon, the starlet is already back on top of her fitness routine! Talk about a committed woman -- literally!