The supermodels made surprise cameos at “Mariah Carey: The Celebration of Mimi Live.”

Because as an old school diva, dammit, somebody’s gotta do it.

Careywrote on Instagramon Monday.

Mariah Carey, Heidi Klum, Tyra Banks

(l-r) Heidi Klum, Mariah Carey, and Tyra Banks.Brenton Ho, Powers Imagery

“Thanks for being such great sports!”

That journey includes 19 No.

1 hits (18 self-penned, thank you) and more than 200 million albums sold.

Mariah Carey, Heidi Klum, Tyra Banks

(l-r) Heidi Klum, Mariah Carey, and Tyra Banks.Brenton Ho, Powers Imagery

Carey’s Vegas show, which has been sold out since opening night, runs through April 27.

She’ll return for eight more newly-added dates in July and August.

Because, again, somebody’s gotta do it.