She first appeared in The Herb Alpert and the TJB TV Special (13 October 1974), and The Muppet Show: Sex and Violence TV Special (19 March 1975).
Her lust for fame and celebrity was only overshadowed by her lust for fellow muppet Kermit the Frog, though it got pretty close sometimes. She may play at being a fainting violet to get her way, but make no mistake, she packs quite a wallop for a foam-rubber puppet, karate-chopping those who displease her with a vigorous "Hiiiii-ya!" She has appeared on various Muppet albums, but only got one all to herself, 1982's bandwagon-jumping Miss Piggy's Aerobique Exercise Workout Album. She has published two books, Miss Piggy's Guide to Life (1983) and In the Kitchen With Miss Piggy (a cookbook, 1996).
Trivia Time! She had her own TV special in 1982, The Fantastic Miss Piggy Show, which guest starred Andy Kaufman's fake singer, Tony Clifton! She was voiced by Frank Oz, who had a bit part in The Blues Brothers movie. Also, when the character was first conceived, she was called "Miss Piggy Lee," the name a parody of real singer Peggy Lee. This got dropped quickly and she was always officially referred to as just "Miss Piggy." Official proof here (scroll down to Question #95).