It's been just over three months since Reese Witherspoon gave birth to son Tennessee, and the new mom showed off her post-baby bod on the beach last week!

The 36-year-old shed her white sundress to reveal a navy blue one-piece. Daughter Ava Phillippe donned a fun floral bikini while her baby brother was protected from the Hawaiian heat in a hat. Check out the pics and then click on the "Launch Gallery" to see even more celebrity post-baby bods.

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We've been missing Reese on the big screen, but her new film "Devil's Knot" -- based on the infamous West Memphis Three -- is getting a ton of buzz.

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