Katherine Heigl greeted Grey's Anatomy co-star and sort-of on-screen boyfriend Justin Chambers at her 30th birthday dinner at L.A.'s Rose restaurant Monday.

Both are happily married to others, of course (Katherine to singer Josh Kelley and Justin to former modeling agent Keisha, with whom he has five children), but it's always neat to see our favorite cast members hanging out as friends together off the set ...

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