If you have been on Instagram within the last couple of days, chances are you noticed women posting black and white selfies. It's for a social media challenge that aims to both empower and celebrate women of all different backgrounds, shapes and ethnicities. 

Everyone from Khloe Kardashian to tennis' very own Garbine Muguruza accepted the challenge by friends who nominated them. 

 
 
 
 
 
 
 
 
 
 
 
 
 

Wednesday’s B&W moments ???? #challengeaccepted

A post shared by GАЯВIÑE МUGUЯUΖΑ (@garbimuguruza) on

These selfies show the faces of strong, independent and fierce women. By nominating others, it keeps the cycle of support and love for women flowing. 

 
 
 
 
 
 
 
 
 
 
 
 
 

Challenge accepted!! Thank you for the nomination @mellylec #womansupportingwomen ???? @benediktrenc

A post shared by Barbora Strycova???? (@barborastrycova) on

So far, over three million photos have been uploaded with the #ChallengeAccepted hashtag and the number is continuing to increase. Barbora Strycova and Donna Vekic also jumped in on the social movement.

 
 
 
 
 
 
 
 
 
 
 
 
 

#challengeaccepted ????????#womensupportingwomen

A post shared by Donna Vekic (@donnavekic) on

Although the posts don't require too much to be written in the caption, the photos of these inspirational faces remind the world just how important they are, and also remind women to do better to elevate other women. 

 
 
 
 
 
 
 
 
 
 
 
 
 

Women supporting other women challenge ???? #challengeaccepted

A post shared by Amanda Kay Victoria (@amandaanisimova) on

"All my beautiful, strong and inspiring women, thank you for your nomination and thank you for motivating, inspiring, empowering and pushing thru the obstacles with your heads held high," Victoria Azarenka wrote. 

The on-going trend also encourages women to share a photo of themselves that they feel both confident and beautiful in. Many of the top WTA players participating, tennis fans are sure to see more. 

 
 
 
 
 
 
 
 
 
 
 
 
 

#challangeaccepted ???? Lift each other ???? #womensupportingwomen Thank you @elkeclijsters @domimonami ????

A post shared by Elise Mertens (@mertenselise) on

Often times social media can be a place filled with trolls and haters, but these types of challenges remind the world that social platforms can be used for the better.