I bet it's the first time he's seen Eddie this year - I reckon there were some Oscar congratulations going on there. Looking at the Getty pictures they shook hands with one hand each, then moved to the double-handed handshake, then went into a full-on body hug.
Similarly he probably hasn't seen Elizabeth Moss since last year when they finished filming, and Jessica Chastain since Comic Con.
I'm glad to see him looking happy - he has seemed a bit subdued to me recently.