Foster and her sisters struggled with being perceived as spoiled rich kids while living a different reality, "We did not have a trust fund; we had to have a job.

She starred in roles in The Big Bounce, Entourage, Crossing Jordan, CSI: Crime Scene Investigation, and Psych 9.

In 2009, Foster started in the recurring role of Jen Clark on The CW drama series 90210.

Foster dated Benicio del Toro, Leonardo Di Caprio, and David Spade.

[11] In 2006, Foster began dating German professional tennis player Tommy Haas.