We're not sure what the etiquette is around royal families but we're pretty sure it doesn't include looking at the female members' chests.
Clearly the Finnish president's husband didn't get the memo and was caught on camera sneaking a peek at Princess Mary of Denmark's bosom.
Pentti Arajarvi, who is married to the Finnish president Tarja Halonen, was attending a royal dinner in Copenhagen when he was spied acting a little creepy by the princess, who not-so-subtly covered her chest.
So far more than 14,000 people have watched a video of the incident on YouTube.
Look at his face, he's trying to be cool but he knows he's been rumbled. Bet he wishes he'd stayed at home.