Pop stars and more congregated at the IHeart Radio Festival in Las Vegas this weekend, looking wild and crazy in their ensembles. It's a live festival, so attire was loose and casual (unless you were Diddy), and they were able to push the boundaries of fashion. Like Katy Perry, who had strange bun-like appendages sitting atop her head, did. Meanwhile, Miley Cyrus paired a revealing, bathing suit-like stage outfit with sneakers.

She also went Gaga -- literally -- with her white mesh/netted "dress" over black pasties and dominatrix-like undies.

See our recap of red carpet walkers and their cray cray ensembles.

Katy Perry rocked Princess Lea buns + strappy heels.

Katy Perry IHeart Radio
Jason Kempin, Getty Images
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Can she communicate with life on other planets via those buns?

Katy Perry IHeart Radio
Bryan Steffy, Getty Images
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The man in black ... Robin Thicke. Is a single hair out of place? Nope.

Robin Thicke IHeart Radio
Jason Kempin, Getty Images
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A hybrid of dominatrix beachwear for Miley. Risque and anything but modest.

Miley Cyrus iHeart Radio Festival
Jason Kempin, Getty Images
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Miley really took the plunge.

Miley Cyrus iHeart Radio Festival
Christopher Polk, Getty Images
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Cher Lloyd was a golden goddess with those kicks.

Miley Cyrus iHeart Radio Festival
Mark Davis, Getty Images
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Diddy classed things up in a tux.

Diddy iHeart Radio Festival
Jason Kempin, Getty Images
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Avril Lavigne put on her war paint and really big platform boots. What's with the fur sleeves in Vegas, too?

Diddy iHeart Radio Festival
Mark Davis, Getty Images
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Kelly Rowland's boots were made for walking and they meant business.

Diddy iHeart Radio Festival
David Becker, Getty Images
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Breezy cracked a smile during an interview.

Chris Brown iHeart Radio Festival
Bryan Steffy, Getty Images
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The ladies of TLC once ruled this roost! They're still hot, especially in leather.

TLC iHeart Radio Festival
Jason Kempin, Getty Images
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Check out Jason Derulo in that custom sliced Nirvana tee.

Jason Derulo iHeart Radio Festival
Mark Davis, Getty Images
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