Hi - I believe what you're seeing is a part of the dressmaybe the shadow of a seam or something. She is too much of a professional at this to make a mistake involving bright lights, cameras, and no underwear.
-Jane

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Lol! I just looked and it does look like that. Could be the shadow of a seam toohard to say! The slit on the dress goes quite high looking at the other pictures so it would be very risk to go without and she could have been wearing a thong.
Hahaha, this made me laugh.