Watch Nick Jonas Serenade Sexy Pentagon on 'Sesame Street'

"Chainsaw" singer will appear on HBO's children's program this Saturday

Nick Jonas serenades a pentagon and octagon with a slinky R&B song on Saturday's episode of 'Sesame Street.'

Nick Jonas stopped by Sesame Street to teach kids different kinds of shapes. In a preview of his guest spot on former PBS program that has recently moved to HBO, Jonas joins Cookie Monster, the Count and Bert to serenade a pentagon as they "Check That Shape."

"It's a shape that is so fine," Jonas sings with his puppet squad. The R&B groove is vaguely reminiscent of his hit single "Chains." "Yeah, the shape drives me out of my mind/ How it moves and how the shape slides." From there, Jonas counts the sides on a pentagon and on an octagon. Swoon. 

Jonas will appear in an episode set to air on Saturday, May 21st on HBO at 9 a.m. EST. He will release his album Last Year Was Complicated featuring singles "Close" and "Chainsaw" on June 10th.