La Fountain was born to a French American father and a Finnish mother, after they had met during the 1980 Winter Olympics in Lake Placid, New York. Her mother is an artist and her father runs a family business, managing a restaurant and a hotel in New York. After her parents separated, La Fountain moved to Finland with her mother, who then married Kosti Kuronen, the Finnish architect, who has designed around 50 golf courses in Europe.
Ainy initially started her career from an advertising company. Later on when she came to Pakistan she started working in drama serials. She started off with the drama serial ‘Zip Bus Chup Raho’ in 2011 which was telecasted on Geo TV. In 2012, Jaffri appeared in a lead role in Hum TV's program Aseerzadi. In 2013 she made her film debut in Humayun Saeed's production Main Hoon Shahid Afridi. Ainy Jaffri has also voiced the main character Jiya in the animated series, Burka Avenger. She also appeared in Balu Mahi with Osman Khalid Butt, a film by Haissam Hussain.
