Star Tracks: Celebs on Social

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

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

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

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.

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."

“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.

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

"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.)

"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.

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

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.”

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.

"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!"

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

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!' "

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.

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

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.

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.