The 41-year-old singer, who is known to appear in a half-black-half-blonde faux hair and never show her face, was seen in a fresh look sans her wig as she walked through LAX, reported Billboard.
"The Greatest" singer also teased an appearance on "Sesame Street", before she will perform at the Dubai World Cup horse race on March 25.
Sia also took to Instagram to announce her appearance on the popular TV show.
"Start your Saturday bright and early with Sia and the @SesameStreet crew at 9 AM on @HBO - Team Sia," she wrote, alongside a picture with the muppets in her usual avatar with a clown's red nose and big pink bow on her head.