Jingle BallPhoto: Getty Images

Our 2015 iHeartRadio Jingle Ball was one of the best ones yet. Santa came early with the star-studded lineup who dominated all of Madison Square Garden in New York City on December 11th. Everyone was there to deck the halls, including 5 Seconds of Summer, Selena Gomez, Zedd, DNCE, Calvin Harris, R. City, Charlie Puth, Tove Lo, Fifth Harmony, Shawn Mendes, Fetty Wap, Demi Lovato, The Weekend, Hailee Steinfeld, Nick Jonas, and Conrad Sewell.

You'll be able to relive the night on The CW during a special 90-minute broadcast on December 25th and December 30th at 8 p.m. ET/PT -- so put on your Santa hats, grab some gingerbread cookies, and tune in!

And don't forget to join the conversation on social media by using the hashtag #iHeartJingleBall

While you may have already tuned into the live stream on Yahoo! Live to see all of your favorite artists' great performances, there was also a lot happening backstage and onstage that you DIDN'T see. But we're here to gift you with that too.

Here are 11 things you DIDN'T see at our 2015 iHeartRadio Jingle Ball: 

 

1. 5 Seconds of Summer licked R2D2.

2. When Selena Gomez was all of us. "Oh, it's a video."

3. And when Selena wanted to be the Sixth Harmony.

4. Fifth Harmony warmed up their vocals by singing along to Nick Jonas's performance. 

5. Plus, they sang their best Mariah Carey "I'll I Want For Christmas Is You." FYI, they have a song called "Like Mariah."

6. Joe Jonas licked Adele's face...

joe licks adele 2

...and then Cole Whittle Adele-napped her.

cole adele nap

7. Charlie Puth Beatboxed all the Christmas songs plus Ariana Grande's "Focus," Demi Lovato's "Cool For The Summer," Fifth Harmony's "Worth It," and Taylor Swift's "Blank Space."

8. 5 Seconds of Summer wore matching ugly adorable Christmas sweaters.

5 Seconds of SummerPhoto: Getty Images

9. All of the Zeddlina feels.

Zedd, Selena GomezPhoto: Getty Images

10. This Santa piggyback ride.

11. Demi Lovato fell at the end of "Cool For The Summer," and handled it like a graceful champion.