Katherine Heigl Pays T.R. Knight a Visit

Grey’s Anatomy star Katherine Heigl runs errands and stops off at co-star T.R. Knight‘s house in Los Feliz on Thursday afternoon

First, Katherine stopped off at her mother’s house before she paid a visit to her friend T.R. Knight.

Asked if she’s returning to the show next season, Katherine, 29, told Life & Style, “Of course, absolutely. Those people are like my family.”

“It’s so funny because we have such serious material to perform, and then we spend the whole day joking around.”

10+ more pics of Katherine Heigl visiting her Grey’s Anatomy co-star…