Born in Haarlem in the Netherlands, De Jongh became interested in ballet when she was four years old after seeing a performance of The Sleeping Beauty on television.
In 2014, the Dutch National Ballet reported that De Jongh was the only dancer currently working with the company who had gone through all the ranks, from aspirant (1996) to principal (2003).
[3] De Jongh has danced many leading roles at the National Ballet including those in classical ballets such as Romeo and Juliet, Swan Lake, Giselle, The Sleeping Beauty and The Nutcracker.
She has also starred in La Bayadère, in Bournonville's La Sylphide and in Balanchine's Agon, Apollo and Jewels as well as in ballets choreographed by William Forsythe, Ted Brandsen, David Dawson and Wayne Eagling.
[3] She is said to be the muse of Hans van Manen Since the end of 2016 she is in a relationship with Dutch actor Thijs Römer, they married in October 2019.