Sarah Jessica Parker
Lucky lady! The actress has the honor of introducing Justin Bieber at Z100's Jingle Ball in New York City.
Chris Rock
The A-list actor and his daughter Zahra Savannah Rock attend Z100's Jingle Ball 2016 presented by Capital One at Madison Square Garden in New York.
Ramona Singer
How does she look?! The Real Housewives of New York City star picks up Brookstone swag at Z100's artist gift lounge.
Ryan Seacrest & Olivia Culpo
The On-Air With Ryan Seacrest host and supermodel are ready for a night of nonstop music at Z100's Jingle Ball in New York City.
Britney Spears
The "Make Me" songstress celebrated her 35th birthday onstage at 102.7 KIIS FM's Jingle Ball concert in Los Angeles.
Meghan Trainor
She's all about that bass... and the holidays!
Justin Bieber
Mellow in yellow: The "Sorry" crooner revs up the crowd.
Bruno Mars
Guess who's back again? Bruno!
Fifth Harmony
The girl group sings their hearts out onstage.
Niall Horan
The One Direction singer hits Jingle Ball for yet another solo performance.
Britney Spears & Tinashe
The dynamic duo rocks their latest collaboration, "Slumber Party."
Alessia Cara
The "Scars to Your Beautiful" singer-songwriter is all smiles during her live performance.
Diplo
The famous DJ hits the stage at Jingle Ball with an electric performance.
Becca Tilley
Three holiday style trends this The Bachelor star totally nails? Fur, velvet and sequins!
Witney Carson & Carson McAllister
Say cheese! The Dancing With the Stars pro and her husband pose for a selfie backstage thanks to their FUJIFILM INSTAX camera.
Tinashe
Damn, Gina! The R&B singer sexes things up in a lingerie-inspired red carpet look.
Yara Shahidi
When not watching her favorite artists perform, the Black-ish star checks out DIFF Eyewear backstage.
Amanda Stanton & Josh Murray
Date night done right! The Bachelor in Paradise couple get cozy for a photo.
Daya
Before taking the stage at 102.7 KIISFM's Jingle Ball, the singer checks out So So Happy clothing.
Fifth Harmony
Hey girls, hey! The "Work From Home" ladies showcase their signature styles before rocking out in L.A.
Chrissy Metz
The This Is Us star looks fabulous as ever for Jingle Ball.
Lance Bass
The former boybander steps out for a fun night of music and holiday spirit.
Camilla Luddington
The pregnant Grey's Anatomy actress looks chic in her festive, printed mini-dress.