Originating as a social media movement to raise awareness for femicide in Turkey, the #ChallengeAccepted social media challenge has morphed into a larger movement for #womenempoweringwomen – with more than five million posts (and counting).

The rules are simple: once tagged, you must post a black and white photo of yourself onto your Instagram feed and tag up to 20 other women (friends, family, colleagues, etc.) to pass on the “challenge.”

See also: #ChallengeAccepted: What you should know before posting a black and white selfie

As you might’ve noticed, everyone and their grandma seems to have jumped on the trend – with international and local Hong Kong influencers and celebrities leading the way with some of the strongest and most powerful black and white posts. Here are some of our favourites, including several from our former #legend cover stars:

Cara Delevingne

View this post on Instagram

#ChallengeAccepted 🖤 ‘Here’s to strong women. May we know them. May we be them. May we raise them.’ Always lift up and empower the women in your life. #WomenSupportingWomen

A post shared by Cara Delevingne (@caradelevingne) on Jul 26, 2020 at 8:59pm PDT

Read our cover story with Cara Delevingne

Feiping Chang

View this post on Instagram

⋆ Challenge accepted ⋆ @deedeepoon @bastianw – who run the world? 👯‍♀️ #sisterhood #womenempowerment #womensupportingwomen Tagging all you ladies to join in this! A photo in itself means nothing, but this challenge is a nice reminder to all of us to uplift and support one another! 🖤🤍🖤

A post shared by Feiping Chang 張翡玶 (@xoxofei) on Jul 27, 2020 at 6:54am PDT

Coco Lee

View this post on Instagram

#challengeaccepted @glamaross I didn’t want to post my own pic coz I thought only of my mom so I wanna share this beautiful pic of her when she was studying in Peking university.. She is my role model, my hero, my everything n she is the strongest woman I know. I want to be more like her. I wouldn’t be here without my mother. N happy birthday mama.. I love u. 💖💖💖 #strongwomen #loving #kind #womenempowerment #supporteachother #unconditinallove #inspiration

A post shared by CoCo Lee (@cocolee) on Jul 27, 2020 at 6:41am PDT

Read our cover story with Coco Lee

Demi Lovato

View this post on Instagram

To all the strong women who’ve nominated me… #challengeaccepted @cassandragrey @iamjojo @iamkittens @rubyrose @libbykelter @sarasampaio @katesowers5

A post shared by Demi Lovato (@ddlovato) on Jul 27, 2020 at 6:13pm PDT

Read our cover story with Demi Lovato

Antonia Li

View this post on Instagram

Some women fear the fire & some women simply become it… 🎇 #ChallengeAccepted 🎆 @sabrinawfung @yujen1 @adelenec @bastianw #wearestrongertogether #empoweringwomen #womenlifteachother #womensupportingwomen

A post shared by Antonia Michela Li 李家彤 (@antoniamli) on Jul 27, 2020 at 6:03am PDT

Zoe Saldana

View this post on Instagram

I accept the #challenge . Love the sisterhood of women today. ~ Acepto el #reto . Adoro la hermandad de mujeres hoy. Gracias @daniajramirez . I nominate @la_leovarela @cissaldana @marsalwebb @makeupbyvera7 @petraflannery @elsamariecollins

A post shared by Zoe Saldana (@zoesaldana) on Jul 26, 2020 at 4:31pm PDT

Read our cover story with Zoe Saldana

Amanda Strang

View this post on Instagram

Challenge accepted! #empoweringwomen #womenlifteachother #womensupportingwomen 📸 @shuxxxlin @angelnhy 👗 @pacorabanne @joycehk

A post shared by Amanda Strang (@amandastrang_) on Jul 27, 2020 at 4:34am PDT

Chiara Ferragni

View this post on Instagram

We rise by lifting others 🙏🏻 I always love a challenge when I can support other women I admire.. Thank you @laurapausini, @sabinabli and all the other incredible women who nominated me.. I nominate @valentinaferragni @fraferragni @veronicaferraro @pardiszarei @martina_mac @rachelzeilic that are some of my closest friends and women that make me feel empowered.. Women, we’re so strong, and together we can be even stronger 🙏🏻 #WomenSupportingWomen #WomenEmpoweringWomen Pic by @giampaolosgura ❤️

A post shared by Chiara Ferragni ✨ (@chiaraferragni) on Jul 28, 2020 at 2:01am PDT

Read our cover story with Chiara Ferragni

Angie Ng

View this post on Instagram

Challenge accepted 🖤 #womensupportingwomen @samanthaxvaughn @vickieho23

A post shared by Angie Ng / 伍靜麗 (@angiengcl) on Jul 27, 2020 at 6:26am PDT

Ruby Rose

View this post on Instagram

#Challengeaccepted Women appreciating and uplifting women, lets go. thank you @riawna @carlysnook @bellathorne @catmcneil @leahmlewis ❤️

A post shared by Ruby Rose (@rubyrose) on Jul 27, 2020 at 9:37am PDT

Read our cover story with Ruby Rose

Utah Lee

View this post on Instagram

Challenge Accepted ✨ I know we ladies can do so much 💪🏽⚡️ Make smart choices and kick ass…this is how we do business 🔥😎 Honored to have been nominated by a lot of friends to speak up and share positive thinking 💥 thank you and let’s go🔥 #utahlee #womensupportingwomen #empoweringwomen #womenempowerment 📷 by @lambiseverywhere

A post shared by Utah Lee 😎✌🏼 (@utahlee) on Jul 28, 2020 at 7:34am PDT

Jessica Jann

View this post on Instagram

Challenge Accepted! 💐💐💐 Thanks @sweetcil @wrini @stephshek @michellesyu.li @aydeetie @danictravels @lingcpong @carolinefwy @janelouey @rikkolee @elizabethyeung #womensupportingwomen #womenempowerment #strongertogether

A post shared by Jessica Jann 湛琪清 (@jessjann) on Jul 27, 2020 at 10:03pm PDT

See more from the #ChallengeAccepted feed on Instagram, and learn more about its origins here.