Today is International Women’s Day, a day to celebrate women’s achievements throughout history and across nations.

IWD has been celebrated on March 8 since 1977, when the United Nations proclaimed the date as a time to reflect on progress made for women’s rights, to call for change and to celebrate acts of courage and determination by ordinary women who have played an extraordinary role in the history of their countries and communities.

The WTA marked the date with the #MySuperwoman campaign, and the stars of the WTA also took to Twitter to celebrate International Women’s Day 2016. 

Here’s what they had to say:

#perfection #happyinternationalwomensday❤️ pic.twitter.com/7VG8duT3Mz

— Elina Svitolina (@ElinaSvitolina) March 8, 2016

#OneDayIWill achieve equal rights and opportunities for all. Share your aspiration using #OneDayIWill this #IWD! pic.twitter.com/pw9fKQ2HEf

— Billie Jean King (@BillieJeanKing) March 8, 2016

I got the first flowers of the day from my coach this morning ? #womensday pic.twitter.com/RLcvCJTaCz

— Sorana Cirstea (@sorana_cirstea) March 8, 2016

Девочки,сегодня наш день! Давайте постараемся нести больше позитива,добра и света,ведь этого так не хватает нам! ❤️? pic.twitter.com/6jm0OcMIpn

— Svetlana Kuznetsova (@SvetlanaK27) March 8, 2016

Happy women's day?❤️? to all women out there but most importantly to do most inspiring women in… https://t.co/aAjlIWm3KQ

— Daniela Hantuchová (@dhantuchova) March 8, 2016

@TimeaOfficial @SteffiBuchli SuperWoman ! ?

— Patrice Touchard (@PatriceTouchard) March 8, 2016

#IWD2016 ???? pic.twitter.com/OqsvxG9PzW

— Madison Keys (@Madison_Keys) March 8, 2016

Девочки,с8 марта!Желаю всем вам весны,любви, признаний,объятий,а так же искренних слов и исполнения всех желаний!??? pic.twitter.com/tTJXpGwSbB

— Elena Vesnina (@EVesnina001) March 8, 2016

Happy #InternationalWomenDay everyone! https://t.co/jd9o3CUcWQ

— Petra Kvitova (@Petra_Kvitova) March 8, 2016

#MySuperwoman is My mother! ?
What about your Superwoman? #InternationalWomensDay #IWD2016 #loveyoumum pic.twitter.com/VaDtalJcOX

— Caroline Garcia (@CaroGarcia) March 8, 2016

Here’s to women’s STRENGTH, BEAUTY & BRILLIANCE just like a diamond!
After all you are… https://t.co/x7H1QdsbSq

— Serena Williams (@serenawilliams) March 8, 2016