Miley Cyrus cries during live \'Wrecking Ball\' performance

Miley Cyrus sang a tearful rendition of \"Wrecking Ball,\" and Robin Thicke and Katy Perry took to the stage in Las Vegas for the iHeartRadio Musical Festival. The festival, held Friday and Saturday at the MGM Grand was Cyrus\' first performance since calling off her engagement to actor Liam Hemsworth, People magazine reported. Her set opened with \"We Can\'t Stop,\" in which she tweaked with little people on stage, as people dressed as mushrooms, rainbows and flowers danced behind her. During \"Wrecking Ball,\" mascara-stained tears streamed down her face as she sang, People said. The festival also included performances by Elton John, Chris Brown, Thicke, Perry and Adam Lambert. Thicke suffered a wardrobe malfunction during his performance when the button and zipper on his pants broke, People said.