Tom & Katie Know How To Party

Apparently Katie LOVES parties, which is why she stopped at her NYC building's "low key" Christmas party for a whole 2-3 minutes to chat with neighbors, according to Page Six.

P6's source says the Denim Diva "was very nice, even though she always has the bodyguard with her. She only stayed for about two minutes to make small talk with some of her neighbors on the way to her waiting SUV." How nice of her to pause for the party like that!

And speaking of parties, Tom's got "some special things" in store for Katie's 30th birthday which is this Thursday.

The actor told Access Hollywood, “We’re gonna celebrate, I’ll be here in the morning with her.” (Tom's jetting to Los Angeles that day to attend the LA Valkyrie premiere.) He didn't spill the deets on just what those "special things" would be but he did say, “It’s gonna be a great day for her.”

What do you think he's going to get the woman who already has it all?