Notice the use of 'fucking' to denote ultra seriousness.
edit: after reading further up. Oh don't get me started on having threepio be built by annie. Good grief. Why didn't yoda tell Luke he knows his pal, Chewbacca personally? Damn... Yeah maybe he should have told Luke, "Hey, tell chewbacca you must... Owe me five bucks he does."
Back on topic. I concur with the person who always assumed threepio didn't know what the princess looked like exactly. I took that way but also kind of think he was just trying to stay out of trouble and not let luke know about the princess or is just being classic threepio who as we saw in esb can be somewhat unreliable and useless unlike R2.