Watch David Letterman bring Julia Roberts to tears

Here’s a behind-the-scenes tidbit that should warm the very cockles of your heart: Apparently, David Letterman has sent Julia Roberts flowers on her birthday every single year for the last 15 years. Well, with one exception — the star’s 46th birthday, which she celebrated Oct. 28. Oops!

The mistake may have been calculated, though — because here’s what happened when Letterman welcomed Roberts to his show Thursday night:

All together now: Awww!