She had been partying in Sydney with friends just hours before she went to the nearby Diamond Bay Cliffs at around 6.30am to watch the sunrise.
Madalyn had a big following on Instagram.
Hundreds of tributes have poured in for Madalyn from her friends, followers and other well-wishers.
Cerys Phillips said: “RIP to one of the most beautiful, inspiring and funny people I had the pleasure to call my friend.
“It seems like only yesterday we were having sleepovers and throwing massive house parties together every other night.
“I’m so glad you were able to experience travelling the world like you said you would, and I’m forever grateful to be able to have called you my friend. I love you always.”
She had been on holiday in Australia.
Shash A Jordan added: “It was a pleasure knowing you Maddie. You were beautiful inside as well as the outside. RIP.”
Mellisa Holden said: “Rest in peace Madalyn Davis, it was a pleasure to have known you. Shocked, to say the least! Condolences to the whole family.”
She fell from a cliff at a popular tourist spot.
Jord Salthouse said: “Madalyn Davis you will be missed so much you were always the life of any party and could make anyone smile.
“An absolute joy to party with, someone who brought smiles and laughter to everything we did, and someone that has left us way too soon.
“Life is so cruel and unfair sometimes man. Do not take it for granted and live every second like it’s your last. Rest easy princess. You are forever loved and missed in our hearts.”
Friends of the young model said she was “beautiful inside and out”
Rebecca Thompson said: “The most heartbreaking news that I still can’t believe is real. You were such a talented, funny, kind and beautiful girls inside and out.”
Emergency services went to Diamond Bay to reports a woman had fallen off a cliff before launching an air and water search.
She had been partying with friends just hours before she went to the nearby Diamond Bay Cliffs.
One concerned family member wrote online that she was unable to get hold of her before another confirmed that Madalyn had died.
Madalyn’s body was found by the search teams at around 10.30am on Saturday.
Her death has prompted calls for more signage and higher fences to prevent more deaths on Australia’s coastline.
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