Julia Roberts displayed a very flat stomach in "Blue Swimwear" at Hawaii

However, the following day when the group hit the beach, Roberts decided to keep her body hidden and wore a black bikini with a navy blue vest on top.

She then began felling self conscious about the lower half of her figure and wrapped a long purple kaftan around her waist - although the Hawaiian breeze didn't make it easy for her.

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Having trouble there? The Hawaiian breeze made it difficult for Roberts to wrap the kaftan around her waist

Covering up: The U.S. star wore a navy blue best and a tie dye headscarf (Read more and See more Pictures)