Pure Goldie was a 1971 TV special featuring Goldie Hawn, with guests Ruth Buzzi, Johnny Carson, and The Muppets.
Goldie kisses Kermit and rather than Kermit turning into a Prince, Goldie turns into a Muppet! Ruth and Johnny turn into Muppets when they try to remedy Goldie with a kiss each. They finish the sketch the only way they know how, by singing 'Mahna Mahna'.