Kate Upton really knows her target audience.

The two-time Sports Illustrated swimsuit edition cover girl shared a racy photo with her Twitter followers on Tuesday which we're sure had her fans salivating at their computer screens.

The blond bombshell wore a breast-baring white bikini which showed off considerable cleavage which would make Courtney Stodden jealous.

The model, who turned 21 in June (we can't believe she's the same age as Selena Gomez), captioned the pic "Rough life." Yep Kate, we're sure it's difficult to be you!

In fact, the American Vogue superstar has been working lately, shooting the film "The Other Woman" with Cameron Diaz and Leslie Mann. Just look at her frolic in a bikini! Now that's tough work.

Besides making us envious of her great legs, Kate is also busy with her day job, which includes doing a nude photo shoot and posing for Vogue Brazil.

Keep up the good work, Kate!

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