We may not know what we're getting for Christmas yet - but it sounds like Katherine Heigl's getting married! We caught up with the eternally-gracious Knocked Up knockout yesterday as she picked up her wedding invitations, and she XCLUSIVELY revealed that she's finally set a date for her wedding - December 23rd! She also expressed her hopes that some of her Grey's Anatomy co-stars would be able to attend. You and us both, Katherine!