It's been a wild week for Miley Cyrus.

After four years together, the 20-year-old announced her split from Liam Hemsworth on Sept. 16, then dealt with rumors that he moved on with singer Eiza Gonzalez and finally headed to Las Vegas for the iHeart Radio Music Festival this weekend.

So after a hectic few days of ups and downs, the "Wrecking Ball" singer found time to relax poolside in Vegas -- and shared a picture of it. Cyrus posted a photo of herself rocking a tiny black bikini on Twitter today (Sept. 22) after she put on a racy performance during the music fest.

Cyrus also shared a photo of herself with a baby kangaroo:

Now, we're not sure if this is meant to be a jab at Hemsworth -- he is Australian, as are kangaroos -- or if Cyrus was just in a cuddly mood. Either way, she definitely showed her ex what he's missing.

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