Celebrities like Justin Bieber, Miley Cyrus, and Jessica Biel celebrate their moms on Mother's Day. Credit: Jason Merritt/Getty Images; Jason LaVeris/FilmMagic; Monica Schipper/FilmMagic

Sunday, May 11 was a big day for mothers all over the world, celebrities included! Many A-Listers celebrated their moms on social media from Twitter to Instagram. 

See what they had to say:

Kourtney Kardashian: Happy Mother's Day everyone! ?@KrisJenner? you are my inspiration and I am so proud to call you my mom!

Christina Aguilera: Happy Mother’s Day! Remember to make each moment with your children unforgettable

Madonna: One Lucky Mother! #livingforlove

Hilary Duff: Happy Mother's Day to all you wonderful hard working,loving, giving, strong, fabulous, kind, mommies out there!be proud if yourself today

Justin Bieber: I love her with all my heart. Happy Mother's Day ?@pattiemallette?! Love you.

Kendall Jenner: happy Mother's Day momma! wish I was home to spend the day with you!

Miley Cyrus: Happy Mother's Day mama tishcyrus

Bill Clinton: #HappyMothersDay to the mom and mom-to-be in my life, and to all mothers everywhere.

Jenna Ushkowitz: Happy Mothers Day to the woman who taught me how to love, be kind and a strong independent woman, love you Mom. And a Happy Birthday to my Dad, who always treated me like a Princess and believed in me no matter what. Love you guys. You're the best. Happy day:) @bradush#judiush

Jessica Biel: Happy Mother's Day to all the mamas out there... especially mine whose laughter is like sunshine. I  U mom!

Ashley Tisdale: Happy Mothers Day to the most supportive and loving mom, I am so thankful for you. You do so much for our family and it doesn't go unnoticed. Love you mommy

Christian Siriano: Happy Mother's Day to all the fabulous moms who support their children no matter what they choose to do in life.

Justin Timberlake: #HappyMothersDay to Janet Lynn... You're the greatest leader and I'm so proud to be your son. I love you so much, Momma!! J

Gwen Stefani: happy mother's day to all the mamas #igotitfrommymama gx