Who was on Kristen shirt in Panic Room?

You're likely referring to the movie "Panic Room" starring Jodie Foster. In the movie, the character played by Jodie Foster, Meg Altman, wears a t-shirt with a graphic of the late singer Janis Joplin. This is significant because the character's daughter, Sarah, is named after Joplin's song "Me and Bobby McGee."

There is no character named Kristen in the movie "Panic Room."