Mariah Carey
Cheers! Mimi braved the cold weather to perform for Dick Clark's New Year's Rockin' Eve in New York.
Gwen Stefani
The singer and her son get into the New Year spirit with some festive hats and glasses.
Halsey & G-Eazy
New Year's kiss! The cute couple rings in 2018 with an onstage smooch.
Reese Witherspoon
On Christmas Eve, the actress posted on Instagram sweet photo of all three of her children, including this one of her with her mini-me daughter, Ava Phillippe.
Sarah Hyland and Wells Adams
"Merry Christmas Eve from two people who go to the Ballet in Black Tie Attire and who go to the mall in ridiculously cheesy Xmas sweaters and hats on the same day. I ❤️ you @wellsadams," the actress wrote on Instagram.
Sofia Vergara and Joe Manganiello
Merry Christmas from one of the cutest celeb couples!
Kevin Hart
Christmas colors! The comedian is accompanied by the Rockettes dressed in red and green at The Tonight Show with Jimmy Fallon.
Sarah Michelle Gellar and Freddie Prinze Jr.
"Sending love and kisses this #christmaseve," the Buffy the Vampire Slayer alum wrote on Instagram on Christmas Eve, alongside a video of her and her husband.
Gigi Hadid
"Not the gumdrop buttons!" The style icon and Reebok ambassador hosts an intimate holiday celebration while munching on a gingerbread cookie in New York City.
Ryan Phillippe
Ryan Phillippe shared this post-Christmas shirtless selfie on Instagram with the caption, "movin snowflakes by the O-Z."
Chris Harrison
"From my dramatic family to yours wishing you the most dramatic Christmas... ever," The Bachelor host wrote on Instagram. "We'll see you in one week for the best present of all."
Jamie Foxx
"MERRY CHRISTMAS!!!" the actor wrote on Instagram while wearing a festive onesie from Jammin' Jammies. "#lilblackelf! #blanta #godblesseveryone #bigasschristmastree."
JoJo Fletcher and Jordan Rodgers
JoJo Fletcher and Jordan Rodgers celebrated the holidays with his parents Ed and Darla and Jordan's brother Luke Rodgers.
Tori Spelling & Dean McDermott
Tori Spelling posted this pic with her family in matching Little Trend Setter pajamas. "One of my fave holiday traditions is wearing matching family PJ's on Christmas Day. I think this year's are my fave so far. And, it's Baby Beau's 1st Christmas," she captioned the Instagram post.
Bronx Wentz and Maxwell Johnson
Jessica Simpson posted this sweet pic of her daughter Maxwell Johnson with Maxwell's cousin and Ashlee Simpson's son, Bronx Wentz, on Instagram.
Hoda Kotb
The Today show host and her family celebrate their first Christmas with baby girl Haley Joy.
Nick Lachey and Vanessa Lachey
"No merrier place to spend Christmas than with the most important people in my life! From our family to yours, Merry Christmas!" Nick captioned a series of Instagram pics with his family.
Ryan Lochte
"Merry Christmas from our family to yours!!" Kayla Rae Reid wrote on Instagram while wearing Tipsy Elves. "The two loves of my life. the best gift of all. #family #merrychristmas."
Olivia Culpo
Cookies and cocktails! "Getting in the holiday spirit with @StellaArtois and one of my favorite traditions – decorating cookies!" the brunette beauty posted on Instagram. "#FavoriteTimeofYear #HostOnetoRemember #ad."
Katy Perry
Do-gooder! The famous singer gets children in the holiday spirit during her visit at the Children's Healthcare of Atlanta at Egleston in Georgia.
Bethenny Frankel
"These nuts are crackers...." the Real Housewives of New York City star shared on Instagram while enjoying the holidays with her co-stars.
Gwen Stefani
Let it snow! The singer looks a lot like Elsa on The Tonight Show Starring Jimmy Fallon.
Jimmy Fallon, Anna Kendrick & The Roots
The Tonight Show looks merry and bright as the group belts out "Baby, Please Come Home."
Anna Camp
The Pitch Perfect star joins Captain Morgan and the New York City Holiday Choristers for some Christmas singing in New York City.