Milans was born and raised in Madrid, Spain. In 2011, she made her American television debut appearing in an episode of Law & Order: Special Victims Unit. The following year, she played a leading role in the horror film Devoured.
Milans co-starred in the 2013 drama film The Disappearance of Eleanor Rigby and in 2014 was series regular in the short-lived ABC crime drama series Killer Women. In 2016, she co-starred opposite Gina Torres in the ABC pilot The Death of Eva Sofia Valdez. Milans later returned to Spain to starring in the Movistar+ drama series El embarcadero. She also appeared in American films Asher (2018) and Shazam! (2019).
On March 13, 2020, Milans announced that she became an American citizen.

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