Aguilera -- who is rejoining coaches Pharrell Williams, Adam Levine and Blake Shelton in place of Gwen Stefani this season -- took to Instagram to share a snap of the duo posing next to one of the judge's swivel chairs and, in typical Cyrus fashion, sticking out their tongues.
The "Dirrty" singer, 35, also posted a selfie of her getting primped, captioning it, "Back to work!"
Cyrus, 23, followed in her footsteps, posting a close-up shot which perfectly showed off her bright blue eye makeup.
The former Hannah Montana star revealed on Wednesday that she was joining the 10th season of the singing competition show as a key adviser with an Instagram pic of her licking Aguilera's judge's button, naturally.
Rihanna, Taylor Swift, and Coldplay frontman Chris Martin were previous advisers on the show, whose main job is to provide professional advice to the contestants in addition to the suggestions from their coaches.
Even though Aguilera is replacing Stefani as a coach on the upcoming season, the singer admits she is totally "Team Blake and Gwen" and approves of the No Doubt frontwoman's romance with Shelton. As we patiently wait for the The Voice to return to NBC on Feb. 29, press play on the video below to hear more.