LOS ANGELES (Reuters) - Jessica Chastain is worried that she might be the first unknown actress everyone will get sick of. The 30-year-old redhead plays Brad Pitts wife in filmmaker Terrence Malicks Tree of Life which was awarded the top prize at the Cannes film festival last week. The movie, a meditation on life set against the background of a Midwestern family in the 1950s that also stars Sean Penn. But thats not the only film the newcomer has on her resume, nor the only A-list actors and directors who want to work with her. Tree of Life was shot three years ago but Chastain said her association with the film instantly changed my world and opened doors for me to work with other directors. I know at some point Im going to meet him and it will be really special, she said. Because Im the first person in my family to go to college and I feel he made that possible. I will never experience anything like that again, said Chastain of her first Cannes experience. Im still recovering. It was a week of living on pure adrenaline, no sleep and a lot of excitement.