Katherine Schwarzenegger is celebrating Mother's Day in a special way.

The author shared a sweet and heartwarming message to her famous mom, Maria Shriver, on Sunday. And since it was nearly two weeks ago that news broke Katherine and Chris Pratt were expecting their first child together, this holiday is even more meaningful.

In fact, Katherine explained that her mother's immense love and support has always made her dream of becoming a mom herself.

"Happy Mother's Day to the greatest and most remarkable Mama in the entire world! We are the luckiest 4 kids in the entire world to have you as our mama," The Gift of Forgiveness author wrote on Instagram, alongside a throwback pic of her and Maria.

She added, "I am so beyond blessed to learn from you and you have made me want to be a mama for as long as I can remember. You mother not only us 4, but everyone you come in contact with. You are the Queen mother to all and I am so lucky to have you as my mom. I love you!"

Maria commented on her daughter's sweet message, "Love you to the moon and back it's an honor to be your mama."

We're not crying, you're crying!

Maria and Katherine's post is just one of many stars' heartwarming Mother's Day posts. To see how your fave celebs are celebrating the holiday, scroll through our gallery below!

Scarlet Johannson, Margot Robbie, Cameron Diaz

Getty Images

Nicole Snooki Polizzi, Lorezo LaValle, NYFW

Cindy Ord/Getty Images for Mercedes-Benz Fashion Week

Rita Wilson, Colin Hanks, 2015 Tony Awards. Twitter

Twitter

Motherss Day Pictures, Cardi B, Offset, Culture, Instagram

Instagram

Motherss Day Pictures, Jenna Dewan, Instagram

Instagram

Taylor Swift, Mom, Academy of Country Music Awards

Ethan Miller/Getty Images for dcp

Vanessa Bryant, Natalia Bryant, Bianka Bryant, Capri Bryant, Instagram

Vanessa Bryant / Instagram

Motherss Day Pictures, Demi Lovato

Instagram

Motherss Day Pictures, Jennifer Lopez

Instagram

January Jones, Halloween 2017

Instagram

Maluma, Mother's Day 2020

Instagram

Motherss Day Pictures, Tyler Cameron, Andrea Cameron

Instagram

Motherss Day Pictures, Reese Witherspoon, Tennessee Toth, Ava Phillippe, Deacon Reese Phillippe

Instagram

Motherss Day Pictures, Pink

Instagram

Dorinda Medley, Mother's Day 2020

Instagram

Motherss Day Pictures, Meghan King

Instagram

Motherss Day Pictures, Jessica Biel

Instagram

Selena Gomez, Mom, Gracie Elliot

Jesse Bauer/startraksphoto.com

Halle Berry, 2018 NAACP Image Awards, Show

Maury Phillips/Getty Images for NAACP

Mothers's Day Pictures, Shay Mitchell

Instagram

Maria Shriver, Katherine Schwarzenegger

Nathan Congleton for Getty Images

Mothers Day Gallery, Kristin Cavallari

Instagram

Beyonce Knowles, Tina Knowles

Kevin Mazur/Getty Images

2020 Celebrity Babies, Malika

Instagram

Kylie Jenner, Stormi Webster

Instagram

Mothers Day Gallery, Kourtney Kardashian

Instagram

Mothers Day Gallery, Jessica Biel, Lea Michele

Twitter

John Legend, Chrissy Teigen, Miles, Luna

Instagram

Gabrielle Union, Kaavia, Instagram

Instagram

Mothers Day Gallery, Jessie James Decker

Instagram

Yolanda Hadid, Gigi Hadid, Zayn Malik

Instagram

Miley Cyrus, Trish Cyrus

Jennifer Cooper, E!

Mothers Day Gallery, Kandi Burruss

Instagram

Mothers Day Gallery, Jessica Biel, Justin Timberlake

Instagram

Giselle Bundchen, Tom Brady, Benjamin Brady, Vivian Brady

Instagram

Mindy Kaling, Instagram

Instagram/Mindy Kaling

Mothers Day Gallery, Savannah Guthrie

Instagram

Olivia Jade Giannulli, Lori Loughlin

Gabriel Olsen/Getty Images for Sephora Collection

Happy Mother's Day!

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