Ariana Grande at her ‘Yours Truly’ Holiday Party on November 26, 2013 – photo: ariana-grande.com

Ariana Grande wore a Black/White Alice + Olivia Fizer Box-Pleated Plaid Skirt ($118.00) at her holiday party in New York City.

Bella Thorne at the 2013 DigiFest in Los Angeles December 14th, 2013 – photo: Just Jared Jr

Bella Thorne attended the 2013 DigiFest in LA on Saturday wearing the Malone Pants ($288.00) and Skyline Metallic Crochet Top ($198.00), both from Rebecca Minkoff.

Zendaya at Hot 101.5’s Hot Holiday Wish Party on December 14, 2013 – photo: patricia_moctezuma

Zendaya met with fans at a radio station Hot 101.5 in Tampa Bay Florida wearing a “Less Drama. More Music.” Old English T-Shirt ($19.99) from The Life Apparel.

“….That onesie though…. Brought to you by @sampanagakos” – instagram

Tay Jardine posted a picture on instagram wearing NFL New York Jets Guys Onesie Footie Pajamas ($40.00) and a Glamour Kills Watchout Grey & Black Cuff Beanie (sold out).

photo posted by Ellie Goulding on instagram

Ellie Goulding posted a picture on instagram wearing the Herve Leger Kaya Signature Top Jacket ($709.00), a J Brand Maxine Leather Skirt ($588.00) and a pair of Stella McCartney EcoLeather Platform Ankle Boots ($1,072). You can get the look with a Bebe Top ($39.95), a Forever 21 Skirt ($19.80) and Jeffrey Campbell Boots ($175.00).

photo posted by Little Mix on Twitter

Little Mix posted this photo of Perrie today wearing a Treatment Clothing White Custom Floral Sleeved Sweater (£25.00).

Paramore interviewed backstage at KISS 108’s Jingle Ball on December 14, 2013 – video: kiss108

Hayley Williams wore a Grey and Black Scarf ($26.26) from the band H2O at Jingle Ball in Boston yesterday.

Fifth Harmony backstage at the KISS 108 Jingle Ball December 14th, 2013 – photo: fifth-harmony.org

Normani Kordei Hamilton posed backstage at KISS 108’s Jingle Ball with her bandmates yesterday wearing an American Apparel Striped Baby Rip Crop T ($24.00).

Fifth Harmony backstage at the KISS 108 Jingle Ball December 14th, 2013 – Debby Wong / Bigstock.com

Lauren Jauregui posed with her bandmates backstage at the KISS 108 Jingle Ball last night wearing her American Apparel Velvet Crop Tee ($36.00) a Topshop MOTO Black Acid Denim Skirt ($56.00), the Topshop Gunmetal Lurex Baroque Tights ($28.00) and Steve Madden Azure Boots ($109.95).

Ariana Grande at Z100’s Jingle Ball 2013 at Madison Square Garden on December 13, 2013 – photo: ariana-grande.com

Ariana Grande hung out backstage at Jingle Ball in New York wearing a Topshop Knitted Super Fluffy Bomber ($170.00). Get the look for less with a fuzzy cardigan from Forever 21 ($27.80).