Reese Witherspoon bared her incredible, bikini-ready body in multiple colored and printed swimsuits while relaxing poolside in Hawaii last weekend. Credit: AKM-GSI

She needs to share her secrets with Us! Reese Witherspoon bared her incredible, bikini-ready body in multiple colored and printed swimsuits while relaxing poolside in Hawaii last weekend.

The Oscar winner, 37, sizzled in a pink lavender-colored, bandeau bikini top and matching bottom, which she accessorized with a woven, multi-strand necklace and funky shades. The mother of three -- whose son Tennessee was born back in September 2012 -- sported her wedding ring and band, and left her short, layered, trademark blonde tresses down as she relaxed by the pool. See more pics of Reese here.

Witherspoon and husband Jim Toth arrived in Hawaii on Friday, Jan. 3 for Justin Bartha's intimate wedding ceremony to trainer Lia Smith, which was held the following day in O'ahu. An eyewitness told Us Weekly that upon her arrival, Witherspoon enjoyed a few mai tais at the pool bar of the Turtle Bay Resort, where she and Toth stayed.

The hot mama also showed off her flat, toned tummy and muscular legs in a floral printed, halter-neck, neon bikini by Seafolly while soaking in the Hawaiin sun on her balcony. (Witherspoon is mom to daughter Ava, 14, and son Deacon, 10, with ex-husband Ryan Phillippe, and Tennessee, 15 months, with second hubby Toth.)

As for how she manages to maintain her hot body, Witherspoon told Us back in 2012, "I work out all the time anyway just to stay healthy. I don't believe in crash dieting or anything like that."