Celestia is definitely taking the holiday spirit to its extremes, plus her hat and socks even add a little kink to it — but if colored that may seem quite different. Using her horn as a built-in mistletoe holder is awesome, and I bet lots of ponies try to get face to face with her when they see it. But it's just lucky Twilight Sparkle, there with bells on, and the ribbon on her dock makes her the best present a teacher could have.
The moment itself is wonderful, that moment of anticipation as they close their eyes and give into faith just before their mouths touch. Very poignant while also so very merry.
Hey, Celestia knows what she wants and given that she basicaly had to pull overtime for the last 1,000 years I can't blame her for taking it now that Luna's around. That said though, I pity the poor colt who makes a move on Twilight when Celestia's in the area.