The iHeart Radio Music Festival at the MGM Grand Hotel and Casino in Las Vegas, Nevada, was a star-studded event over the weekend.

There were appearances by Britney Spears, Olympic medalist Ryan Lochte, Miley Cyrus, Demi Lovato, the Jonas Brothers and many more!

Miley showed off her midsection in a black halfshirt and knee-length silver skirt with leopard-print heels.

Demi Lovato showed off her curves in a tight black dress with gold embroidery, while "Vampire Diaries" star Nina Dobrev opted for a trendy and short lace dress.

Check out more photos of the stars...