When Sia dropped by Sesame Street with her number “S Is for Songs,†the singer failed to mention that S is also for Sia wigs. The long-running show’s goofiest monsters — Elmo, Cookie Monster, Grover, and Abby Cadabby — all donned the “Chandelier†singer’s signature hairdo for the dance party. To return the favor, Sia also captured the Muppets’ look by actually showing her eyes and rocking a round red nose worthy of a lovable wacky felt creature. So really, S is for sharing style.