5 Things You Might Have Missed at the 2017 iHeartRadio Music Awards

The iHeartRadio Music Awards kicked off Sunday night at the Forum in Los Angeles, with Katy Perry, Bruno Mars, Big Sean, and more hitting the stage to rock the event, while Justin Timberlake dropped one serious dose of inspiration.

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After chatting with stars on the carpet, we headed inside to take it all in. Take a peek at five things to know about last night's show!