Prieto began her career in the entertainment industry as a member of "That's Entertainment". In her teen years, she showed the makings of a high-profile model that got her into the modeling industry. At 13, she was fielded in the Elite Model Look Search Philippines 1994 (formerly Look of the Year) and she emerged as one of the finalists. Top model Linda Evangelista flew into Manila to judge the search. Prieto, then known as Anna Marie Falcon did ramp modelling and photoshoots with her stunning Eurasian features towering at in her teen years.