Show-promotion, Muppet-style: Kermit the Frog and Miss Piggy have now called it quits, but they're vowing to remain professional on their new prime-time comedy, The Muppets, premiering Sept. 22 on ABC. The pair confirmed their breakup at a biannual ABC panel for TV critics today. An official statement followed on their official Twitter accounts. "People change. So do frogs and pigs. ... We were together for a long, long time and it's personal," says Kermit. The Muppets is a mockumentary-style look at Kermit, Piggy, Fozzie, and the gang as they produce a late-night talk show for Miss Piggy called Up Late With Miss Piggy. (More Miss Piggy stories.)