Rihanna Shows Her ASSets & Touches It All For iHEARTRADIO Fest, Usher & Lil' Wayne Also

Music superstars Rihanna, Lil' Wayne and Usher hit the stage for night 1 of the huge iHeartRadio Music Festival in Las Vegas last night. See performances and pics inside......

Last night, Rihanna closed out day one of iHeartRadio Music Festival in Las Vegas.

RiRi rocked a shiny #23 jersey mini dress created by fashion designer Jeremy Scott. She tweeted: 'JEREMY SCOTT YOU ARE DAT N****!!! #jersey #hat #trills*** #veryrare.'

After her set,  the singer rushed off to work on her new album.

Just before her performance:

She revealed that her new single "Diamonds" will world premiere on the "Elvis Duran Show" at 8amET on Wednesday.   Watch her describe the video as happy, hippie and hopeful:

Watch Rihanna perform "What's My Name" at iHeartRadio festival:

Watch "Only Girl (In The World)" below:

"Please Don't Stop The Music" below:

Also....

Rapper Lil' Wayne & his Trukfit were spotted backstage during the Festival.

Earlier, he performed a set that featured Young Money artist Shanell and his girl Keyshia:

Keyshia Cole was on hand to perform their hit "Enough of No Love."

This dude is real colorful these days.

And......

The new coach of "The Voice", Usher, also performed last night. 

And as usual, he let an audience member come on stage to grind it out.

Earlier, radio host JoJo Wright talked to him in the Elvis Duran Broadcast Room. 

The Festival continues tonight with Mary J. Blige, Pink, Aerosmith and plenty more.

Photos via Kevin Mazur/WireImage/Christopher Polk/Getty Images North America/David Becker