She may be tired of her relationship with him on Grey’s Anatomy, but in real-life, Katherine Heigl can’t get enough of T.R. Knight.

Not only did he help her celebrate her recent 29th birthday, but Knight, 34, reveals in the current issue of Us Weekly that he’ll be in his Grey’s Anatomy castmate’s wedding party.

He is going to be a bridesman when she ties the knot with singer Josh Kelley, 27, on December 23.

“I’m standing up there and all,” Knight told Us at an L.A. benefit for the Trevor Project on December 2. “So I have to go and get the tux. And I am still deciding on a gift!”

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