M.I.A., Ariana Grande, Rod Stewart Tweet Support for International Women's Day

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Ariana Grande arrives at the The 57th Annual Grammy Awards on February 8, 2015 in Los Angeles, California. 

International Women's Day, an annual event that champions equal rights for women and celebrates advocates of the cause, has garnered plenty of public attention today; marathons and marches have been staged around the world. Celebrities have also given their support online: Beyoncé, Lady Gaga and other celebrities have signed an open letter for equal rights by the charity ONE, and more have voiced their enthusiasm on Twitter.

Here are some stars who've weighed in on International Women's Day, including Ariana Grande, M.I.A., Rod Stewart, Josh Groban and Yoko Ono:



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