The Office Stars
It's an Office reunion! B.J. Novak celebrated his 40th birthday with several of his past co-stars, including BFF Mindy Kaling.
Emma Watson
In honor of Harry Potter creator J.K. Rowling's 54th birthday, Watson posted a throwback photo of the two with co-star Evanna Lynch at a costume party.
Beyoncé
The singer stunned in this red vintage gown at her and Jay-Z's niece Teanna's Great Gatsby-themed 21st birthday party.
Selena Gomez
"Sometimes I can't express how truly grateful I am," the star wrote. "Now.. Back to work."
Hilary Duff
The star posted this adorable photo of her son Luca bonding with his baby sister Banks.
Chris Noth
Sex and the City's Mr. Big and Charlotte (Kristin Davis) reunited for a night out and were also joined by his Law & Order co-star Jill Hennessy. He wrote, "It's a threesome - Sex and the Order!" Sarah Jessica Parker commented, "Wait what??? How did I miss that??? X"
Jennifer Lopez and Alex Rodriguez
The former New York Yankees star accompanied his singer girlfriend to a short visit to Israel, where she performed in Tel Aviv. During their trip, they journeyed to Jerusalem to see the holy sites.
Jade Roper
The Bachelor in Paradise alum gave birth to her and husband and co-star Tanner Tolbert's second child...in their master closet! No, that was not planned.
John Legend
The singer enjoyed some father-daughter time with his and wife Chrissy Teigen's little girl Luna at the beach.
Zoey 101 Stars
Speaking of cast reunions, soon after reports surfaced claiming Jamie Lynn Spears was in talks with Nickelodeon for a reboot of the show, it was revealed that some of her co-stars and show creator Dan Schneider got together for dinner.
Stassi Schroeder and Beau Clark
The Vanderpump Rules star got engaged and celebrated with her man and co-stars.
Rachel Lindsay
The Bachelorette star partied with her girlfriends during her bachelorette weekend in Costa Rica.
Kim Zolciak-Biermann and Kroy Biermann
The Don't Be Tardy... stars got frisky during their family vacay to the Turks and Caicos Islands.
Kourtney Kardashian
The Keeping Up With the Kardashians star posed in a bikini.
JoJo Siwa, Nia Sioux and Kendall Vertes
There was a Dance Moms reunion!
Cardi B and Kulture
The rapper and Offset's daughter took her toy luxury car out for a spin.