iHeartRadio Music Festival Day 2: Florida Georgia Line Brings Out Backstreet Boys, Britney Scorches & More Highlights

If you tuned into our 2016 iHeartRadio Music Festival, you were well aware of all the action that went down at the sold-out T-Mobile Arena for night-two of Sin City affair. From Britney Spears' scorching kickoff set to the surprise Florida Georgia Line and Backstreet Boys collaboration, it was an evening that made way for some of the most exciting (and talked about) music moments of the year.

Didn't catch the live broadcast of the Vegas affair? Well, shame on you. Thankfully, we're kind and have provided you with an all encompassing list of highlights from the second night of the festival. Take a look below!

You can also catch a two-night TV special with all of the best moments of the show on October 6th and 7th on The CW. at 8 p.m. ET/PT.

Britney Scorches

Britney Spears brought forth the energy and feist of the woman we fell in love with years ago. Offering the crowd plenty of razzle dazzle and choreography with 8 female and 8 male backup dancers, the pop star whipped her way through a number of hits, including "Womanizer" and "I'm A Slave 4 U," but it wasn't just her classics. During her set, she also lifted a dance tribute to the one and only Missy Elliott from her Vegas show. If you needed your dose of new B cuts, you had some Glory-ious choices, including "Do You Wanna Come Over?" as well as "Make Me," which featured a special guest appearance from G-Eazy for the finale performance. It's Britney, b*tch.

Backstreet's Back With Florida Georgia Line (Alright)

With the news of Backstreet Boys' new "Larger Than Life" Las Vegas residency out this week, and being that the guys were in town, Florida Georgia Line and BSB came together once again for a surprise performance of the 1997 pop hit. And it was glorious.

No, Really ... They're Back!

After surprising the crowd by performing “Everybody (Backstreet’s Back),” the Backstreet Boys came back out on stage to perform their own mini set following the announcement of their brand new Las Vegas residency “Larger Than Life.” The guys gave us all a taste of what fans can expect from their new show, and it looks like it’s going to be EPIC. During their iHeartRadio Music Festival performance, the group performed three of their biggest hits including “I Want It That Way,” “As Long As You Love Me,” and “Larger Than Life."

BSB + Tinashe = <3

Speaking of BSB, just hours after blazing our iHeartRadio Music Festival Daytime Village, Tinashe star made a quick outfit change, took to our sold-out T-Mobile Arena and spoke with iHeartRadio's very own Paul Costabile about the evening affair. "I'm saving up tonight for the Backstreet Boys because I've never seen them live. See, the '90s kid in me is obviously coming out tonight." Mere moments later, the boy band appeared mid-interview because calling the Backstreet Boys' name clearly is the key to spontaneous appearances. Not only did Tinashe's inner geek become present right then and there, but the two acts went into an impromptu duet of "Everybody (Backstreet's Back)."

Ariana + Zedd's Reunion

Decked out in an oversized yellow trench coat and tube top, Ariana Grande made way through goodies like "Into You," "Be Alright" and "Everything," but the real surprise arrived mid-set when she brought out a familiar face to the sold-out T-Mobile Arena. "I want to bring a very special guest to the stage, ya'll," she said when introducing the EDM hit-maker. "He's pretty incredible, y'all." Instead of hopping on his turntables, the Russian-German DJ took the stage and hopped on a drum set for their 2014 mega-hit, "Break Free." If you needed any proof of the musical talents behind a DJ like Zedd, then here was your evidence.

Zedd's All-Star iHeartParty 

Zedd dropped an amazing set during the 2016 iHeartRadio Music Festival, which included all of his biggest hits. But the producer/DJ brought quite a few of his collaborators on-stage with him to help him perform his songs. Nasri from MAGIC! came out to sing the band’s hit single “Rude,” which Zedd remixed, Aloe Blacc took the stage to perform their 2016 song “Candyman,” and finally, Hailee Steinfeld and Grey joined him on stage as he stepped out from behind the DJ booth to perform “Starving.” Don’t need no butterflies when Zedd gives you the whole damn zoo.

Cage The Elephant's Cardio Run

Cage The Elephant frontman Matthew Schultz delivered an intense, raw energy to Night 2 of the iHeartRadio Music Festival in Las Vegas. Though the T-Mobile Arena may be huge, Schultz got up close and personal with the audience, unexpectedly running through the crowd to wrap up their incredible performance. 

Sting's Timeless Message

Sting treated the crowd to his solo song, “I Can’t Stop Thinking About You," three Police hits – “Message In A Bottle,” “Every Breath You Take” and “Next To You,” and also, for the first time in America, the English singer played his new tune, “50,000,” which was inspired by the deaths of David Bowie, Prince, Glenn Frey and Lemmy Kilmister.

Usher surprised the crowd with special guests Ludacris and Lil Jon -- causing us to threw our As up with a quickness. Power 105.1's The Breakfast Club and Jussie Smollett introduced Usher out onstage and as soon as he hit it, the festival went to a new level. People who watched him felt both feelings of nostalgia and excitement to see what else the superstar has up his sleeve in the near future. Anyone who's a fan of music knows how difficult this is for artists to make their fans feel. But, Usher did this effortlessly and like a true seasoned boss.

Photo: Chris Polk for iHeartRadio