Fifth Harmony's Camila Cabello branched out on her own to record a duet with Shawn Mendes that has taken off in big ways!

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Cabello has been making rounds with Mendes performing "I Know What You Did Last Summer" at various Jingle Ball stops that the Canadian musician has been on the lineup for, but Friday night, she also got to perform with her fellow 5H girls too.

Mendes and Cabello gave yet another energetic performance at Jingle Ball in New York City's Madison Square Garden!

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Cabello looked extra festive in a sparkly outfit standing next to Mendes in his signature tee and jeans.

iHeartRadio even said the pair "KILLED" during their performance! You can catch a glimpse of it below.

The two hung out backstage before even hitting the stage together.

They also went out to the Island Records 2015 Holiday Party together after Jingle Ball in New York City came to an end.

Anyway, both artists gushed on social media about performing at Madison Square Garden since it is so iconic. Cabello was able to perform twice Friday evening, with her pal Mendes and her bandmates, which surely is something she'll never forget.

"I cannot believe we just played Madison Square Garden," she beamed on Twitter.

It definitely sounds like something she'll never forget.

Plus, Mendes claimed it's "INSANE" getting to perform at Madison Square Garden.

MSG TODAY GUYS! INSANE I LOVE U #Z100JingleBall A photo posted by Shawn Mendes (@shawnmendes) on Dec 11, 2015 at 6:47am PST

Both of these artists definitely had a big year and 2016 is looking pretty bright too!