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Madonna, Taylor Swift

Kevin Winter/Getty Images for iHeartMedia

What a night!

That's our immediate reaction after watching the 2015 iHeartRadio Music Awards that featured a whole lot of must-see musical moments.

For three hours straight, A-list performers including Jamie Foxx, Chris Brown, Kelly Clarkson and Meghan Trainor brought down the Shrine Auditorium with their unexpected collaborations, catchy tunes and killer stage presence. 

If you missed out on the big show, we've got you covered! Take a look at six must-see moments that will have everyone chatting Monday morning! 

Can't Sit With Us: Got any room for us, Justin Timberlake? The "Suit and Tie" singer easily had the best table of the night as he enjoyed the evening next to Ryan SeacrestSnoop Dogg, Tom Ford and Hailee Steinfeld. Plus, how can we not fall in love with his reaction to Taylor Swift  winning Best Lyrics? Looks like somebody has watched the "Blank Space" music video.

We All Scream for Billy: While Foxx delivered plenty of jokes as host, it was Billy Eichner's sketch before introducing Florida Georgia Line that got everyone LOLing. How much do we love Madonna? What about Sam Smith? How about Robert Durst? One of these is not like the other exciting audience members.

Happiest Newlywed: Just one week after saying "I Do" to Brittany Kerr, country crooner Jason Aldean arrived in Los Angeles to perform "Burnin' It Down." Complete with fire and cowboy hats, being married has never felt so hot!

Jennifer Hudson, Iggy Azalea

Kevin Winter/Getty Images for iHeartMedia

Battle of the Opener: Iggy Azalea and Jennifer Hudson kicked things off with the first performance of the night. And while we loved Officer Hudson, it was a little too similar to their Kids Choice Awards gig just 24 hours earlier. Luckily, Nick Jonas switched things up when he was tangled in chains during his performance. He may just be the sexiest prisoner we've ever seen! 

Best Collaboration: Bet you didn't see this coming! During Madonna's performance of "Ghosttown," it was the one and only T. Swift who stepped on stage to perform with a guitar. "Surprise! #MadonnaAndTaylor," the "Shake It Off" crooner tweeted minutes after her gig. And yes, friends. It started trending immediately. 

Shake It Off: We get it. T.Swift is featured a lot in this post. But how could we not end an awards show without the singer dancing to Snoop Dogg of all people? We're not sure what "Peaches N Cream" really means. But for Swift, the song provided a good enough beat to shake around too. Never stop, girl. 

For more scoop from the iHeartRadio Music Awards, watch E! News Monday at 7 and 11 p.m.