17-Year-Old Courtney Stodden DEFILES CHRISTMAS -- Is Nothing Sacred?!?!?!

Shameless underage fame whore Courtney Stodden couldn't leave well enough alone this weekend -- stripping down to a sacrilegiously tiny bikini in 30-degree weather ... and single-handedly destroying our Christmas spirit.

We can't decide if this makes it more or less creepy, but the guy in the Santa suit is Courtney's 51-year-old husband Doug Hutchinson -- and Saturday, the barely legal couple abandoned whatever shred of dignity they had left ... and exchanged dirty talk in the snow just north of L.A.