WATCH: Billie Eilish sings 'Happier than Ever' on Sesame Street

In a new video released days before its' new season airs, Sesame Street has shared a clip of Billie Eilish performing her recent song 'Happier than Ever' on the show.

Singing a number based duet with the maths obsessed vampire character The Count, Eilish is one of the many musicians announced as guest stars for the upcoming season of the long-running children's TV show.

Anderson .Paak, Kacey Musgraves and Jon Batiste will also appear on the show with .Paak set to perform a special song written for a Martin Luther King day episode.

Sesame Street made the news recently when American conservative politicians criticised the show after the character Big Bird tweeted that they received the COVID-19 vaccine.

Big Bird, a giant yellow talking bird, was branded a communist by Republican Arizona State Senator Wendy Rodgers in a bizarre response to the tweet.

In other Billie Eilish news, the 'Bad Guy' singer recently called for "urgent action" from world leaders to combat climate change at the COP26 summit.

"This year our leaders are deciding the global actions required on the environment climate emergency in a critical decade for our planet," Eilish said in a video posted with scientific group Arctic Basecamps.

"We must stand together and speak up to save our planet, not just for us, but for our future generations, and we need urgent, urgent action now and to work together as one."

Watch Billie Eilish perform 'Happier than Ever' with The Count on Sesame Street.