At the Oct. 15 performance of their 'Sweat' tour, Charli XCX & Troye Sivan surprised the audience with new musical guests.

Content creator and entrepreneur Charli D’Amelio shares her style and beauty essentials with CNN Underscored.

Kesha was there beside her, reclaiming “Tik Tok” as a founding document of Charli’s hot-mess aesthetic and well-honed songcraft.

The crowd then got significantly louder when Kesha went on to do her 2010 pop anthem “ Tik Tok.” Charli’s audience is definitely not too cool for that song. Watch some videos below.

In a new candid TikTok video, Charli XCX explained why she is having a hard time 'letting go' of 'Brat.' ...

TikTok star Charli D'Amelio is doing OK after Broadway injury that saw a piece of the "& Juliet" set fall on her over the weekend.

Charli D'Amelio is a TikTok sensation. Now, she's settling into a supporting role on Broadway and loves sharing the spotlight.

Charli XCX swapped brat green for bridal whites as she announces her recent wedding to The 1975's George Daniel.

Charli XCX subtly and playfully referenced her old feud with Marina (formerly Marina and the Diamonds) on TikTok. Watch here.

Top creators, including Daniel Mac, Quen Blackwell and Charli D'Amelio, say they've been trying new approaches to their social media strategies.