Grey's Anatomy star Katherine Heigl was shocked to find out her co-star and friend T. R. Knight was gay - because she had spent the show's pilot flirting with him. The Knocked Up beauty was single when shooting began on the hit U.S. show - and 35-year-old hunk Knight caught her eye.

However, the actress' romantic plans didn't make result in any romantic liaisons - because her lustful looks were ignored as Knight is gay.

She says, "When we were filming the pilot I was single and so was he and I kind of had my eye on him. I was getting nowhere and I was super-confused. I was like, 'Hello? Do I have something hanging out of my nose? Why aren't you paying any attention to me? Needless to say, it quickly became a friendship once he told me."

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(This news article provided by World Entertainment News Network)