A regular in the Spanish runways, Alonso didn't make the jump internationally until she finished her studies. Once completing her studies she coincided with John Pfeiffer. In Florence, June 2008, Diane von Furstenberg hired Alonso for her "Cruise 2008-09" collection and months later was called to New York for the Spring-Summer 2009 fashion shows. While in New York, she also had the opportunity to work for Custo Barcelona. At 21 Alonso became Spain's new top model, chosen to be in the Victoria's Secret 2008 fashion show held in Miami. Only two Spaniards, Esther Cañadas in 1997, and Eugenia Silva in 1998 and 1999, had previously participated in the Victoria's Secret fashion show.[4][5]
She has walked for Bottega Veneta, Luisa Beccaria, Brian Reyes, Nanette Lepore, Oscar de la Renta, Tory Burch, Cynthia Steffe, Luca Luca, Diane von Furstenberg, Lela Rose, Prabal Gurung, Abaeté, and Resort 2009 Diane von Furstenberg.[6]
Alonso won L´Oreal award best model for Cibeles f/w 2010.[7] She is the face for Agua Fresca de Rosas fragrance by Adolfo Domínguez and appears in its TV spot.[8][9] She also did the lingerie campaign for GUESS shot by Yu Tsai in Los Angeles[10] Stars in AX Armani Exchange Spring 2011 advertising campaign with compatriot Alejandra Alonso.[11] In 2014, Alonso was the face of the new Triumph Essence product range for lingerie manufacturer Triumph International.[12]
Alonso had a Spanish language blog for Vogue Spain where she connected with other fashionistas.[13]
In 2015, she appeared for Pantene Water Damage campaign.
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