María Alexandra Catherine Siachoque Gaete (born 21 January 1972) is a Colombian actress best known for her (mostly villainess) roles in numerous telenovelas.

Though she has become typecast as a villainess, some consider her a sympathetic character as Doña Hilda de Santana in Telemundo telenovela Sin Senos no hay Paraíso.

In 2011, she later played a complex character in another telenovela remake produced by Telemundo, La Casa de al Lado wherein she was the mistress (amante) of a character portrayed by her real-life husband Miguel Varoni, wherein she interacted with Maritza Rodríguez, Gabriel Porras, and Karla Monroig.

In 2014, she marked her villainess return in Reina de Corazónes, starring Paola Núñez, Eugenio Siller and Juan Soler.

They acted together in a series called “Te voy a ensenar a querer”, “La Casa de Al Lado”.