It was Mother's Day in the US on Sunday and a host of celebrities took to Instagram to mark the special occasion.

Actor and director Ben Affleck shared a heartfelt message to his ex-wife Jennifer Garner, with whom he shares three children.

He wrote: "So happy to share these kids with you. Luckiest parents in the world. Thanks for all the good you do."

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Justin Timberlake hailed his wife Jessica Biel as "the heart of this family", saying their sons "look up to you and love you unconditionally."

He added of his own mother: "And mom - your strength and support have taught me everything I know about being a parent. I’m so grateful for your guidance and I hope I make you proud. Happy Mother’s Day to all the BADASS Mom’s out there! I bow down to you all!"

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John Legend wrote of his wife Chrissy Tiegen: "Happy Mother's Day to my wonderful wife! It’s been a year that tested you in so many ways but you’ve come through stronger, wiser, happier and a better mother than ever.

"I’m so fortunate to have you as my partner, my inspiration and my best friend. I love you forever."

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Hollywood star Ryan Reynolds credited wife Blake Lively as "the heart and soul of every moment this family shares."

"I’m grateful for the light and for the kindness you smuggle into each and every second of our lives," he continued.

"I see you in the eyes of our children… Every laugh. Every blink and every thoughtful moment of vulnerability. The tender grit it takes to be a mother in 2021 is an act of pure strength and heroism."

The Deadpool actor couldn't resist a cheeky joke, adding: "Never could I have predicted anonymous airport bathroom sex would lead to this. Or how you'd hire Dog The Bounty Hunter to find me.

"Either way, I’m lucky to reflect a little of the sunlight you shine on all of us. Happy Mother’s Day, my love."

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Chris Hemsworth posted a picture of his wife Elsa Pataky and their three children on Instagram, along with the sweet message: "Happy Mother's Day to all the brilliant, hardworking, kid carrying, bar raising, husband-putting-up-with-ing woman out there!! We salute you."

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Khloe Kardashian wrote of Kardashian-Jenner family matriarch Kris Jenner: "Happy Mother's Day to my Queen! You are my heartbeat!!! Without you we are nothing!

"Thank you for EVERYTHING you do for each and everyone of us. You are love in human form. I will never be able to express how much we all love, adore and cherish everything about you But I will try every single day. I love you queen mommy."

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Kim Kardashian also paid tribute to Kris, writing: "There is no one on this planet that knows me the way you or as long as you have!

"Thank you so much for giving us the best party planning skills, cooking skills and most importantly teaching us how to organize and run a house hold!"

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Chris Pratt posted a candid picture of his wife Katherine Schwarzenegger along with the caption: "This is your first year as a mom, your third year as a stepmom, and 31st year as a hot momma."

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Jennifer Lopez paid tribute to her mother, writing: "It was my mom who instilled in us at a very young age that we could do anything. This was something that has really stayed with me."

She added: "Being a mom is my greatest joy, and today I think about my mommy and all the moms out there. This is your day, and I hope you are surrounded by love, gratitude and appreciation…enjoy it!"

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Former US president Barack Obama paid a touching tribute to Michelle Obama, thanking her for being "such an incredible mom to our girls".

He continued to his 35 million Instagram followers: "And I hope you’ll take a moment to thank the women in your life who love you in that special way that mothers do: biological moms, adoptive moms, and foster moms; single moms, grandmoms and godmothers; aunts and mentors—all the people who come to mind when you think about Mother’s Day.

"Or take a moment, like I will, to remember the moms who raised and sustained us, and who we miss every day - no matter how long it’s been. All of these amazing people deserve our gratitude, today and every day."

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