Miley Cyrus  got emotional in her first performance since calling off her engagement to Liam Hemsworth. The "We Can't Stop" singer took over the stage at the iHeartRadio music festival in Las Vegas today, where she twerked with a group of backup dancers, frolicked around in a skimpy white ensemble, and even started to tear up while performing her breakup anthem "Wrecking Ball." According to reports, Miley started crying  while singing her new hit song, further fueling speculation that the pop number is about Miley's on-again, off-again relationship with Liam. Later, the singer changed into a barely there costume and took to the stage a second time. She also mingled backstage with Khloé and Kourtney Kardashian.
Miley isn't the only star at the big music festival this weekend. Katy Perry  and Robin Thicke kicked off the festival last night, while Kate Hudson  dropped by to add some Hollywood glamour to the event. Be sure to check out all the celebrities at the iHeartRadio music festival .
Miley Cyrus  took to the stage in a tiny white ensemble.
Miley Cyrus  met with Kourtney Kardashian, Khloé Kardashian, and their sisters backstage.
Miley Cyrus  performed in front of a giant mushroom.
Miley Cyrus  showed signs of tears on her cheeks.
Miley Cyrus  changed into a barely-there costume.