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Looking good is the best revenge! Hours after her ex boyfriend announced that he was voluntarily entering rehab on Tuesday, Rihanna Instagramed a bevy of sexy underwater pics while vacationing in the Dominican Republic, which include holding her breasts, drinking underwater and some mermaid-tastic pics.

Pictured in a tiny pink and orange bikini, Rihanna swims, whips her hair and basks in the sun in the picturesque location. Can this girl even take a bad photo? Apparently not.

On Monday Chris Brown's assault charge was reduced from a felony to misdemeanor, his rep confirmed, "Chris Brown has elected to enter a rehab facility. His goal is to gain focus and insight into his past and recent behavior, enabling him to continue the pursuit of his life and his career from a healthier vantage point.'

Prior to that announcement, the felon posted a cryptic tweet which read: "In order to go where u have never gone u have to be willing to go where u never been!!!! #OHB! CBE!"

Whatever you say Chris … we will keep those enlightening (aka redundant) words in mind as we stare at your ex girlfriend looking amazing.