Kim Kardashian is keeping things hot in Miami!

The reality TV star, who is known for posting revealing shots for her fans on Twitter, was at it again this weekend -- where she shared two sexy swimsuit pics for her 15 million followers.

In one posted yesterday, she's seen showing off some crazy cleavage in a very low-cut black one-piece, writing "Good morning Miami."

In the other, from Saturday, she writes "Saturday Suntan."

She's lounging on a yacht in both pics -- and while she's in Miami with boyfriend Kanye West, he's can't be clearly seen in either pic ... unless that's him behind her in the bottom pic:

Check out some of Kim's other sexy TwitPics in the gallery above!

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