Photoshopped... all of ‘em photoshopped. Ms Lawless is a prime candidate for the 'What's the "Holy Grail" of unseen celebrity tits? thread.
Okay, let's put this to rest. She had a wardrobe malfunction a decade or more ago while singing the American national anthem somewhere, as I recall, in California. It was photographed at the time and I've heard it's on youtube. Enjoy.