You may have been looking for the real life star Heather Small who made a celebrity appearance.
Heather Small is the name of a real-life singer whose cardboard cut-out face was stuck to stick, and is used to motivate Miranda and Stevie in the joke shop. She is constantly withdrawn from the counter with the accompanying singing from Stevie.
During 'The Perfect Christmas' Stevie puts tinsel around the cut-out to make it more festive TBA
Stevie met the real Heather Small and they both debated how the song "Proud" should really be sung.
Physical appearance Edit
Heather (as a cut-out) wears her dark hair wavy and untied, dresses in a white gown only the straps of which are seen, and carries with her a chrome microphone, depicted midsong. In the episode "The Perfect Christmas", there is hot pink tinsel hung like a halo around her hair, placed there by Stevie for the sake of festivity.