Katy Perry -- Super Bowl Tribute Tat ... To Honor Myself

Katy Perry truly suffers for her art ... inking a Super Bowl tattoo on her finger last night following her halftime show.

Perry had the roman numerals XLIX tatted on her finger ... to remind herself of the night she was upstaged by her special guest performer Missy Elliot.

Other tats she shoulda considered ...

-- Dancing smiling shark
-- Hot Dog on a Stick costume
-- The gold lion from the MGM Grand
-- Katniss Everdeen fire suit
-- NBC's "The More You Know" shooting star