T.R. Knight and Katherine Heigl by John Sciulli/WireImage.com T.R. Knight and Katherine Heigl by John Sciulli/WireImage.com
Grey's Anatomy's George and Izzie may be at an impasse when it comes to their relationship, but in real life their portrayers soon will be walking down the aisle. When Katherine Heigl marries fiancé Josh Kelley, cast mate and best friend T.R. Knight will be standing up for the duo. On Sunday at the Trevor Project's 10th-annual Cracked Xmas event, Knight told reporters he'll be in Heigl's wedding party. "It's nice to be invited and be witness to it," he said of the nuptials. Though Knight hasn't been helping Heigl with the planning ("She's pretty much gotten that under control"), he

is going down his own wedding checklist. "I'll probably be involved in Josh's bachelor party," he told TV Guide. "I better find out if he's having one. [That's all] wedding etiquette I'm still learning about." -

Reporting by Bekah Wright