Mine is from the Season 5 episode "Que Sorpresa!" where Liz Lemon does a photoshoot in her bra and jeans and she shows off her great body as a result.

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Mine is from the episode where the Night Court cast guest star.

https://2.bp.blogspot.com/_yPWyFZEdY0s/SR3WEP_ip4I/AAAAAAAAHi4/kSErysxJkEU/s400/nightcourt08.jpg