I really don't wanna be looking under rocks, but what's up with Katie and her dismal expressions?

TomKat is in Brazil with little Suri and last night, after a day of frolicking on the beach, Mr. and Mrs. Cruise got sushi for dinner. Tom looks ecstatic as always, but Katie... not so much. Is it just me or does she have a permanent "No, I'm not tired or blah - really!" look on her face?

Tom Cruise