iHeartRadio Festival 2013 Red Carpet: Katy Perry, Miley Cyrus + More [PHOTOS]

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

Can she communicate with life on other planets via those buns?

Katy Perry IHeart Radio

The man in black ... Robin Thicke. Is a single hair out of place? Nope.

Robin Thicke IHeart Radio

A hybrid of dominatrix beachwear for Miley. Risque and anything but modest.

Miley Cyrus iHeart Radio Festival

Miley really took the plunge.

Miley Cyrus iHeart Radio Festival

Cher Lloyd was a golden goddess with those kicks.

Miley Cyrus iHeart Radio Festival

Diddy classed things up in a tux.

Diddy iHeart Radio Festival

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

Kelly Rowland's boots were made for walking and they meant business.

Diddy iHeart Radio Festival

Breezy cracked a smile during an interview.

Chris Brown iHeart Radio Festival

The ladies of TLC once ruled this roost! They're still hot, especially in leather.

TLC iHeart Radio Festival

Check out Jason Derulo in that custom sliced Nirvana tee.

Jason Derulo iHeart Radio Festival