Leave it to Taylor Momsen to ruin my "Gossip Girl" fashion high.

Just when I'd become accustomed to seeing castmates Leighton Meester and Blake Lively modeling the latest goods from Valentino, Gucci and Oscar de la Renta while shooting Season Four, I stumbled upon this picture of Miss Momsen preparing to take the stage for a show in Columbia, Maryland.

Not only can you see the actress's bra and underwear right through her dress, but if you look closely, you'll notice a pack of smokes peeking out of her thigh-highs. Classy!

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Photo: Splash News