International Women's Day 2015: Shakira, Cara Delevingne, Madonna and more celebrities celebrate on social media

Millions of people around the world celebrated International Women's Day on 8 March, honouring the economic, political and social achievements of women.

Celebrities including Shakira, Kerry Washington, Cara Delevingne, Madonna and Ariana Grande took to social media to show their support using #InternationalWomensDay.

On Intl Women's day I want to highlight the power of education as a catalyst to transform the lives of millions of girls around the world.
— Shakira ðŸ¤« (@shakira) March 8, 2015

Repost! Thank you Hilary Clinton! Happy International Womens Day! â¤ï¸ #rebelheart pic.twitter.com/pPBCrK4fon
— Madonna (@Madonna) March 8, 2015

We must stand up for Women's rights, education and health. Join me to make change happen. #IWD2015 pic.twitter.com/xaUcn92N2L
— Victoria Beckham (@victoriabeckham) March 8, 2015

â€œThe question isnâ€™t whoâ€™s going to let me; itâ€™s who is going to stop me.â€
- Ayn Rand. Happy International Women's Day pic.twitter.com/DWQ3wlGoVY
— P!nk (@Pink) March 8, 2015

Wearing purple this afternoon for International #WomensDay & I'll be hanging with a bunch of women friends sooo pretty excited all around! ðŸ˜œ
— kerry washington (@kerrywashington) March 8, 2015

#InternationalWomensDay ðŸ™Œ to the amazing, talented, fragile, strong, loving, giving, funny, deep, magical & inspiring women in my life!
— Kylie Minogue (@kylieminogue) March 8, 2015

Happy Women's Day! Here's to the women who build each other up and encourage each other to be themselves as opposed to tear each other downðŸ’
— Ariana Grande (@ArianaGrande) March 8, 2015

Today & every day I'm grateful for THE most inspirational woman in my life. My beloved Momma. #InternationalWomensDay pic.twitter.com/Ft89jBMkue
— Robin Roberts (@RobinRoberts) March 8, 2015

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I am surrounded by strong women every day. I am so inspired by my strong, smart sisters, mother and grandmother all day long. Most importantly, teach your children (girls and boys) about what today means and lead by example. #internationalwomensday #teachyourboys
A post shared by Kourtney Kardashian (@kourtneykardash) on Mar 8, 2015 at 9:20am PDT

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Happy #internationalwomensday
A post shared by Cara Delevingne (@caradelevingne) on Mar 8, 2015 at 8:45am PDT

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Iâ€™m proud to support the @ClintonFoundationâ€™s #NoCeilings campaign to inspire and advance the full participation of women and girls around the world. My photo is missing from Instagram and a @KateSpadeNY billboards today encouraging us to ask the question, â€œWhat happens when women and girls are #NotThere?â€ On #InternationalWomensDay, make sure to celebrate all the women in your life who ARE! Learn more at Not-There.org.
A post shared by Karlie Kloss (@karliekloss) on Mar 8, 2015 at 1:23pm PDT

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We're Not There...Yet. Inequality exists at work / at home / at the doctor's office / at school - and yet these issues do not get the attention they deserve. It's almost like we're NOT THERE at all. âœ¨Today is International Women's Day and I am taking part in a campaign that literally removes women from the media. âœ¨You too can participate. Spread the word by changing your profile on Instagram, Facebook, Twitter, etc. and visit OurBodyBook.com @thebodybook for more information. #notthereyet #notthereaction #internationalwomensday @clintonfoundation
A post shared by Cameron Diaz (@camerondiaz) on Mar 8, 2015 at 9:31am PDT

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For International Womenâ€™s Day, I am taking a stand for gender equality and I'm joining others to be #NotThere. #IWD2015 Visit: Not-There.org
A post shared by Lupita Nyong'o (@lupitanyongo) on Mar 8, 2015 at 11:36am PDT

Meanwhile, last year in September, actress and UN Women Goodwill Ambassador Emma Watson had asked men to get involved with gender equality, during the HeForShe campaign.

"I was appointed six months ago and the more I have spoken about feminism the more I have realized that fighting for women's rights has too often become synonymous with man-hating," she said.

The Harry Potter star added: "If there is one thing I know for certain, it is that this has to stop. For the record, feminism by definition is: 'The belief that men and women should have equal rights and opportunities. It is the theory of the political, economic and social equality of the sexes.'"