“Snow Angel” singer and Mean Girls actress Rapp appears in the trailer with the beloved Cookie Monster ... a really beautiful song. She’s got a great voice and Elmo hopes she comes back ...

In the trailer for the children's program's 55th season, Reneé Rapp sings with the beloved Cookie Monster, Elmo and Abby Cadabby. "Feelings are real so let them show," Rapp, 24, and the Muppets ...