John Stamos will be performing in live performances of “The Little Mermaid”; soundtrack this weekend, and to borrow his words, “Oh, it’s on!”;

The former “Grandfathered”; star teased part of Disney’s “The Little Mermaid in Concert”; this week with an Instagram post featuring the cast belting out one of the film’s most well-known songs, “Under the Sea.”;

Oh, it’s on! Under the Sea. Tomorrow Hollywood Bowl. @sarabareilles @darrencriss @rebelwilson @titusssawthis

A video posted by John Stamos (@johnstamos) on Jun 2, 2016 at 9:47pm PDT

//platform.instagram.com/en_US/embeds.jsIn addition to Stamos, who plays Chef Louis, the star-studded cast includes Sara Bareilles as Ariel, Rebel Wilson as Ursula, Darren Criss as Prince Eric and Tituss Burgess as Sebastian.

WATCH: 7 Things You Didn’t Know About “The Little Mermaid’

A full orchestra will back the performers when they take the stage at the Hollywood Bowl on Friday and Saturday.

… Like, it’s REALLY happening! #UnderTheSea

A photo posted by Darren Criss (@darrencriss) on Jun 2, 2016 at 5:42pm PDT

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So can’t wait for this weekend #TheLittleMermaidLive

A video posted by Rebel Wilson (@rebelwilson) on Jun 1, 2016 at 9:57pm PDT

//platform.instagram.com/en_US/embeds.jsNot to be outdone by her co-star, Wilson Instagrammed her own promotional photo.

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“Getting ready for “The Little Mermaid Live’ at the Hollywood Bowl this weekend!”; she wrote. “So cool to be rehearsing in the same studio at Sony where Judy Garland recorded “The Wizard of Oz’!”;