Sia made a special guest appearance on HBO's Sesame Street yesterday (March 25).

During her appearance, she introduced the letter ‘S’ and sang about her love of songs with Elmo, Grover, Cookie Monster and Abby Cadabby.

She sang: “‘S’ is for songs, and I love songs/Don’t know what I would do without ‘em/I love songs so much/I wanna sing a song about ‘em.”

Although normally hidden, the singer showed her face in a rare appearance, whilst wearing a red clown nose and her trademark black and white bob wig. The muppets also wore black and white wigs. 

The pop singer follows in the footsteps of Jason DeRulo, Little Big Town, Tori Kelly and James Corden, who have also appeared on this season of the long-running children's TV programme.