AceShowbiz - Rihanna, Justin Bieber and Drake were among the stars who showered their moms with love online for International Mother's Day on Sunday, May 13. The "Work" hitmaker kicked off celebrations for her family matriarch, Monica Fenty, by posting a series of snaps of the pair through the years.

"beautiful. sweet. strong. humble. gang. - @monica_fenty Happy Mother's Day to my fav (sic)!!!," she wrote on Instagram. "sending love to all the mothers, the mothers to be, and the ones who stepped in to be mothers to those who can't be with theirs today! God bless you not just today, but everyday for the thankless and selfless jobs that you do! You're greatly appreciated!!"

beautiful. sweet. strong. humble. gang. - @monica_fenty 💓💓💓 Happy Mother’s Day to my fav’ !!! sending love to all the mothers, the mothers to be, and the ones who stepped in to be mothers to those who can’t be with theirs today! God bless you not just today, but everyday for the thankless and selfless jobs that you do! You’re greatly appreciated!!

A post shared by badgalriri (@badgalriri) on May 13, 2018 at 7:53am PDT

Bieber also shared an old snap of his mother, Pattie Mallette, as he quoted lyrics from Boyz II Men's "A Song for Mama" in the accompanying caption.

You taught me everything Everything you've given me I'll always keep it inside You're the driving force in my life, yeah There isn't anything Or anyone that I could be And it just wouldn't feel right If I didn't have you by my side You were there for me to love and care for me When skies were gray Whenever I was down You were always there to comfort me And no one else can be What you have been to me you will always be You will always be the girl In my life for all times

A post shared by Justin Bieber (@justinbieber) on May 13, 2018 at 7:21am PDT

Fellow Canadian, rapper Drake, also dug out a picture from his childhood and wrote, "Thank you mama for the nine months you carried me through... Happy Mother's Day to all the goddesses world wide."

Thank you mama for the nine months you carried me through...🌸 Happy Mother’s Day to all the goddesses world wide.

A post shared by champagnepapi (@champagnepapi) on May 13, 2018 at 5:38am PDT

Chance the Rapper saluted the ladies who helped shape him into the man he is today, taking to Twitter to post, "Happy Mother's Day to my woman, my mother, my mama jann and all the other women in my life who developed and disciplined me. Thank you for holding me up and holding me accountable."

Happy Mother’s Day to my woman, my mother, my mama jann and all the other women in my life who developed and disciplined me. Thank you for holding me up and holding me accountable

— Chance The Rapper (@chancetherapper) 13 Mei 2018

Meanwhile, Reese Witherspoon tipped her hat to "all the mothers around the world", tweeting, "You're my heroes... You have the hardest job on earth- to care for, nurture and give love to the next generation!" Referencing her own family, she added, "It's my greatest joy being a mom to these 3 wonderful kids. I share this day with you ALL! #MothersDay."

Celebrating all the mothers around the world! You’re my heroes... You have the hardest job on earth- to care for, nurture and give love to the next generation! It’s my greatest joy being a mom to these 3 wonderful kids. I share this day with you ALL! #MothersDay 💕🌸🌷💖 pic.twitter.com/SJOdlQVorO

— Reese Witherspoon (@RWitherspoon) 13 Mei 2018

Pink also paid tribute to her fellow working moms, writing, "On Mother's Day I wanna give a shout out to all the mamas out there busting their butts to put food on the table and love in the hearts of their little ones. I salute you."

On Mother’s Day I wanna give a shout out to all the mamas out there busting their butts to put food on the table and love in the hearts of their little ones. I salute you.

— P!nk (@Pink) 13 Mei 2018

And Madonna remembered her late mum with a touching Instagram message. "Dearest Mother...........You suffered a lot and were not encouraged to follow your dreams or express yourself freely!," she began. "I hope I have been able to carry the Torch for you and that somewhere you are smiling and proud! Happy Mothers Day to you and all Mothers who have struggled, are struggling and continue to struggle. #nevergiveup #mothers #warriors #queens."

Dearest Mother...........You suffered a lot and were not encouraged to follow your dreams or express yourself freely! 🗣 I hope I have been able to carry the Torch for you and that somewhere you are smiling and proud ♥️♥️♥️♥️! Happy Mothers Day to you and all Mothers 🌎🌏🌍 who have struggled, are struggling and continue to struggle. #nevergiveup 👑🙏🏼👑. #mothers #warriors #queens

Sebuah kiriman dibagikan oleh Madonna (@madonna) pada 12 Mei 2018 jam 11:51 PDT

Other stars honoring their mothers on social media included Chris Pratt, Jessica Biel, Priyanka Chopra, and Chris Evans.