When it comes to dressing up for Halloween ... Lady Gaga seems to believe that less is definitely more.

The 26-year-old "Born This Way" songstress, who covered her breasts with a couple of sparkly cannabis leaves, Tweeted the above photo and the following:

    "I was weed for Halloween. Best costume ever! It's so fun. Princess High the Cannabis Queen."

Back in September, Gaga talked about gaining 25 pounds over the past year. By the looks of those toned abs, seems as though Lady G has slimmed down!