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Happy Mother's Day! In honor of all the great moms out there, stars paid tribute to their leading ladies on Sunday, May 10. From Twitter to Instagram, A-listers like Justin Bieber, Usher, and Chris Evans praised their moms. 

See their sweet messages:

Mother's Day tea in paradise. Wishing a very happy Mother's Day to all of you mommies!

A photo posted by Kourtney Kardashian (@kourtneykardash) on May 10, 2015 at 7:55am PDT

Kourtney Kardashian: "Mother's Day tea in paradise. Wishing a very happy Mother's Day to all of you mommies!"

Usher: "What a timeless beauty! @jpatjames Happy Mother's Day Mom....I love this picture. #treasure #classic #blackbeauty #thegoose #beautiful."

Justin Bieber: "This little 4'9 woman may not look like a mom but she is, and she's the best at it!. This woman taught me everything I know, how to love how to be compassionate how to be strong when the only thing u wanna be is weak how to stand when all you want to do is fall. If it wasn't for this woman lets just say I would have had a way LONGER stupid phase. I love u and thank u for not giving up on me!"

Tyra Banks: "Me and Mama when I was 18. Paris. Backstage at a fashion show. Mama, you're my first and forever love. Happy Mama's Day to you! -Ty"

Jill Duggar: "Happy Mother's Day to my mom and all the other mamas out there! I am blessed beyond measure to have such a Godly, selfless, caring mother! Visit www.dillardfamily.com/blog to see new pictures and special Mother's Day posts! #MothersDay #michelleduggar #19kids"

Every day I am thankful for your love and support, Mom. Wishing all the amazing moms out there a #HappyMothersDay –mo

A photo posted by First Lady Michelle Obama (@michelleobama) on May 10, 2015 at 8:26am PDT

Michelle Obama: "Every day I am thankful for your love and support, Mom. Wishing all the amazing moms out there a #HappyMothersDay –mo."

And Mother's Day weekend begins!!!!! #happymothersday

A photo posted by Drew Barrymore (@drewbarrymore) on May 9, 2015 at 10:58am PDT

Drew Barrymore: "And Mother's Day weekend begins!!!!! #happymothersday."

Gigi Hadid: "Happy Mother's Day to my best friend @yolandahfoster You continue to inspire and teach me every day and I feel so blessed to call you my mamma! I love and appreciate you endlessly!!"