LOS ANGELES, Dec 26 — In the world where social media rules, many celebrities have taken to various social media platforms including popular photo-sharing app Instagram to share their holiday festivities.

Many dressed up (or down, depending on your point of view), with Taylor Swift shared a makeup-free shot of her dressed in an elf costume, while her boyfriend Calvin Harris posted a snap of both of them in monochrome outfits against a stark, snowy background.

Khloe Kardashian became a guinea pig-cum-model for her niece North West, posting, “I'm Norths [sic] first makeup client ��”

Mariah Carey dressed down in very Chrismassy pajamas with her four-year-old twins Monroe and Moroccan, and the diva invited Santa to join their family celebration too.

Glee actress Lea Michele spent Christmas with boyfriend Matt Paetz and shared a compilation black-and-white shot of them drinking wine on the couch. However, singer Christina Aguilera dressed up in a skin-tight asymmetrical black dress and posed for a funny shot with her fiancé Matt Ruttler.

Celebrity chef Gordon Ramsey and his family got into the Christmas spirit as well, with son Jack sharing the following snap:

Fergie and husband Josh Duhamel also shared a family shot featuring their cute two-year-old toddler Axl.

Sarah Michelle Gellar and husband Freddie Prinze Jr toasted Christmas with a black-and-white snap.