Katy Perry has been enjoying her Miami vacation poolside and flaunting her killer curves.

On Thursday, she spent the afternoon working on her tan with her sister Angela, and rocked a simple, but sexy black bikini, while reading up on Robert Pattinson in the latest issue of BlackBook magazine. On Friday, Perry was back having more fun in the sun, this time making a splash in a teeny, strapless, yellow tie-dye bikini.

Perry and her pals soaked up the sun before jetting off to Rio de Janeiro, where she was promoting her movie "Katy Perry: Part Of Me 3D."

The 27-year-old singer showed off her impressive cleavage in an inventive manner. The star showed up wearing a high-necked yellow minidress with strategically placed diamond cutouts going down the center of her torso. The dress showed off some major sideboob, just not the side we're used to seeing.

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