Elsa, Britney, Alicia, and More Shared the Sweetest Snaps of Their Kids This Week

Britney Spears and her sons — Sean and Jayden — spent some time with the dolphins in Las Vegas.

Alicia Keys and Swiss Beatz introduced their second baby boy, Genesis Ali Dean, to the world in an Instagram photo that included their entire family (Alicia and Swiss Beatz's son Egypt was seated, and Swiss Beatz's eldest son, Kaseem, was standing).

Tori Spelling's three youngest kids – Stella, Hattie, and Finn — had a sleepover together.

Rachel Zoe flashed back to a sweet photo of her son, Skyler, at a Valentine's Day party.

Cash Warren couldn't believe how big his elder daughter, Honor, is getting.

Michael Bublé tried not to "put his foot in his mouth" during an early-morning phone call.

Harper Smith was a girl of many hats over the weekend.

Joseph Kushner got a push from his mom, Ivanka Trump.

Britney Spears and her boyfriend, Charlie Ebersol, took her boys to lunch in Las Vegas.

Hudson Stone, Lindsay Price and Curtis Stone's son, practiced his window-cleaning skills on his parents' car.

Mila Hager put a smile on her mom Jenna Bush Hager's face.

Alyssa Milano was the picture of multitasking as she nursed Elisabetta and prepared to cohost The Talk.

James Knight showed off his fashionable duds for his mom, Jaime King.

Luca Comrie had some brunch time fun with his uncle.

Brooks and Scott Stuber hunkered down for a healthy breakfast.

Reese Witherspoon shared an adorable photo of her youngest son, Tennessee, and husband, Jim Toth, walking in the rain.

Alicia Keys looked as cool as can be holding her infant son, Genesis.

Liam and Stella McDermott dressed up for Dr. Seuss day at school.

Sarah Michelle Gellar's daughter, Charlotte, got some backstage dance instruction from Kristin Chenoweth.