T.R. KNIGHT has praised his GREY'S ANATOMY co-star Katherine Heigl for her outspoken honesty. Heigl recently shocked Hollywood by labelling her smash hit movie Knocked Up "sexist". But Knight, who watched his close friend Heigl wed singer Josh Kelley last month (Dec07), insists it's Heigl's insistence on speaking the brutal truth that makes her so endearing. He says, "It's rare to find that kind of honesty in someone, whatever the cost. A lot of us care way too much what people think, but it's refreshing to have someone who speaks the kind of truth where your mouth just drops. "To her, being upfront and straight with people is paramount. There's a real freedom to that that I'm still working on, but she's already got it. It's intrinsically who she is."