Star Tracks: Celebs on Social

01 of 19

ANNA KENDRICK

Mean muggin': "We don't like you," wrote the Pitch Perfect actress, captioning a pic of herself posing with a less-than-impressed owl.

02 of 19

STEPHEN COLBERT

Accompanying a call-to-action for additional Puerto Rico aid relief, the late-night host posted a throwback photo of himself on Twitter,

03 of 19

DAVID & HARPER BECKHAM

Like father, like daughter! The retired soccer pro teaches his youngest child the rules of the game.

04 of 19

SERENA WILLIAMS

After dedicating the past two posts to her first child — daughter Alexis Olympia with her fiancé, Reddit co-founder Alexis Ohanian — the tennis champion updated her Instagram with a mirror selfie, proving that she'll be back on the court in no time.

05 of 19

KOURTNEY KARDASHIAN & VICTORIA BECKHAM

The stylish stars rock matching leggy poses, with the fashion designer posting hers shortly after Kardashian captioned her pic, "Victoria, I'll call u later I just got back from the football game."

06 of 19

DREW SCOTT & LINDA PHAN

drew scott instagram https://www.instagram.com/p/BZh8MByBy50/ — Drew Scott/Instagram

“All I yearned for after our Rumba tonight was Linda’s kiss and her words, ‘I Love You,’” the Dancing with the Stars participant wrote on an Instagram of him and his fiancée cuddling up.

07 of 19

BRITNEY SPEARS

We'll never not be impressed by the pop star's dedication to fitness ... and her washboard abs.

08 of 19

THE CAST OF GREY'S ANATOMY

Shonda-Rhimes-knee — Shonda Rhimes/Instagram

"and we took a knee in solidarity of racial justice. #takeaknee#greysanatomy #300th," Grey's Anatomy showrunner Shonda Rhimes shared on Instagram, along with a photo of her, Ellen Pompeo, Jesse Williams and Debbie Allen on one knee at the 300th episode celebration party. (Jason Winston George, who plays Ben Warren, was cropped out of the picture.)

09 of 19

TENNESSEE

"Happy Birthday to my littlest guy, Tennessee!" Reese Witherspoon captioned an adorable Instagram snap of her son holding up a colorful "5" balloon that looked to be bigger than him.

"Every day you bring us so much joy with your sweet smile and beautiful laugh. I love you so much! #feeling5 #HBD," added Witherspoon.

10 of 19

DAVID & HARPER BECKHAM

davkid-beckham-2000 — Victoria Beckham Instagram

So cute! The father-daughter duo share an embrace, which was captured by Victoria Beckham. "We love you," she wrote.

11 of 19

BETHENNY FRANKEL

Frankel continues to share her firsthand account of the devastation in Mexico following last week's 7.1 magnitude earthquake – and pleading for more help for the survivors left homeless and hungry.

“The people have less than zero and they estimate it will cost $11 million dollars to rebuild the town," she said. "People are living outside. Doctors are performing medical exams in the street. It’s the worst thing I’ve ever seen.”

12 of 19

LISA MARIE PRESLEY, HARPER & FINLEY

lisa-marie-pressley — Riley Keough/Instagram

Riley Keough shared a sweet photograph of her famous mother spending time with her twin daughters Harper Vivienne Ann and Finley Aaron Love, 9 next month.

13 of 19

MARIAH CAREY & BRITNEY SPEARS

britney-spears-mariah-carey — Britney Spears/Twitter

"You never know who you're going to meet at dinner parties!! Great night!" Spears wrote of an image of the two hitmakers posing for a smiley snap at dinner. "Great night! So much fun, thank you Cade!"

14 of 19

MINDY KALING

Screen Shot 2017-09-25 at 1.11.48 PM — Mindy Kaling/Instagram

The Mindy Project star and creator shows her shock over a celebratory cake with the words "Series Finale!" decorated on its side.

15 of 19

SERENA WILLIAMS & ALEXIS OLYMPIA

Endless cuddles! "Mama never sleeps," read the caption on the photo, posted to the newborn's own Instagram account. "When she does, I go on adventures with daddy. 'Come on!' "

16 of 19

AXL JACK

On Sunday, Fergie posted a video montage of the sweet date night she shared with her 4-year-old son Axl Jack during a trip to see the musical version of Aladdin.

17 of 19

SCOTT DISICK & SOFIA RICHIE

scott-disick-b — Alec Monopoly/Instagram

New couple alert! Disick and Richie's romance was confirmed on Instagram as the pair shared a kiss during dinner.

18 of 19

JENNY MOLLEN

The actress and author hasn't been shy about showing off her baby bump — and Mollen is showing no signs of stopping now. Case in point: Her nude mirror selfie at 38 weeks.

19 of 19

DREW SCOTT

Scott and Emma Slater took Dancing with the Stars judge Len Goodman's Week 1 "fixer upper" comment to heart. "Soooo.. @theemmaslatersaid I needed a spray tan to bring out my #sexy for Latin night…be careful what you ask for!" Scott captioned an Instagram photo of him posing shirtless and freshly bronzed.