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5 Seconds of Summer got an epic prank pulled on them by The Chainsmokers at iHeartRadio’s 2019 Z100 Jingle Ball!

The band – Luke Hemmings, Michael Clifford, Ashton Irwin, and Calum Hood – posed backstage at the event, presented by Capital One, on Friday (December 13) in New York City.

Their set included “Easier,” “Teeth,” “Who Do You Love” with The Chainsmokers, “Want You Back,” “Youngblood,” and “She Looks So Perfect.”

“Well played, @TheChainsmokers🎉🍆🎤,” 5SOS captioned the Twitter video below, adding with another, “Part 2.”

Watch below to see what happened!

Also pictured inside: 5 Seconds of Summer at Q102′s 2019 Jingle Ball at Wells Fargo Center earlier this week in Philadelphia.

READ MORE: 5 Seconds of Summer Announce ‘No Shame Tour’ 2020

15+ pictures inside of 5 Seconds of Summer at the event… More Here »

Taylor Swift had a very happy birthday and her cake could not have been more perfect for her.

The newly 30-year-old singer snapped a selfie with her cake at her birthday party on Friday night (December 13). The cake featured the faces of her three cats – Olivia Benson, Meredith Grey, and Benjamin Button.

“Fur real guys this was my cake 🎂,” Taylor captioned the photo on her Instagram account.

Taylor rang in her birthday with a special set at the Z100 Jingle Ball concert and then went to a restaurant in the Big Apple to continue the celebrations with some of her best friends.

READ MORE: See which celebrities were at Taylor Swift’s birthday party!

Harry Styles just dropped his new album Fine Line and he celebrated the release with a special one-night-only concert at The Forum on Friday night (December 13) in Los Angeles.

The 25-year-old singer played all of the songs from the new album and he even surprised the crowd by bringing out Stevie Nicks for a performance of her classic song “Landslide.”

Highlights from the show can be viewed on Harry‘s @HSHQ page on Instagram. The live feed was hosted by Matt Bellassai and presented by American Express Experiences.

The new album Fine Line is out now!

WATCH NOW: Harry Styles Performs a Crosswalk Concert (Video)

15+ pictures inside from Harry Styles‘ concert at The Forum… More Here »

Niall Horan takes the cheesiest, but still cutest pic with Lewis Capaldi backstage at Z100′s 2019 Jingle Ball at Madison Square Garden on Friday (December 13) in New York City.

The two pals and future tour mates both performed at the show later on in the night. Niall actually took a break from Saturday Night Live rehearsals for the show.

PHOTOS: Check out the latest pics of Niall Horan

Niall‘s former bandmate, Louis Tomlinson, is also pictured below, performing at the z100 All Access Lounge presented by Poland Spring Pre-Show at Pier 36 earlier in the day.

Check out over 40+ pics inside of Niall Horan, Louis Tomlinson and Lewis Capaldi…

Camila Cabello completely kills it on stage at Z100′s 2019 Jingle Ball at Madison Square Garden on Friday (December 13) in New York City.

The 22-year-old “First Man” singer wore a striking latex outfit that was lined with pearls for her set at the annual holiday concert.

PHOTOS: Check out the latest pics of Camila Cabello

That same night, Fletcher was also seen performing on the main stage before hitting the red carpet alongside Lennon Stella. Lennon also performed at the pre-show festivities.

If you missed it, Camila revealed just where she’d be spending New Year’s Eve!

FYI: Camila wore a Redemption dress on the red carpet.

65+ pics inside of Camila Cabello, Fletcher and Lennon Stella at Z100′s Jingle Ball 2019…