Can you guess which sexy star gave a lil’ sneak peek of underboob in this eye-popping shot? It’s Thirsty Thursday indeed, so sip up our clues and see if you can score the unknown celeb …

She may be a big celeb from Canada, but she’s still a pretty little liar … You can tell from this smokin’ shot that she’s a fashionista — so much so she was a guest judge on “Project Runway.”