They’re supposed to be bright and bubbly, the knot of girls rehearsing for this weekend’s performances of Cole Porter’s “Anything Goes” at Scarsdale High School.

They’re supposed to be as vibrant as the bright yellow “Anything Goes” hoodies they wear in rehearsal.

But, at this particular moment, they’re not.

Director Adrienne Meyer has seen this before. She gathers the girls downstage and intones: “When you’re on, you’re great. When you’re not, you’re boring. Never be boring.”

And, just like that, when they run the scene again, the girls sparkle and bubble and are anything but boring.

“Anything Goes,” Porter’s musical of romance and hijinks on the high seas, has plenty going for it. Start with a score that includes “You’re the Top,” “Friendship,” “Blow, Gabriel, Blow” and the title song.

To that, Meyer adds a dozen tap-dancers in a cast of nearly 60.

Mix in some sailor costumes, an orchestra, lights and an onstage ship with two long staircases and, well, anything goes.

Reno Sweeney – a role played by Broadway belters Ethel Merman and Patti LuPone – is 16-year-old junior Gracie Nash.

She is a veteran of the French Woods Festival of the Performing Arts in Hancock, N.Y., where she just spent her sixth summer learning about acting and improvisation, appearing in “The House of Blue Leaves,” “Our Town” and “The Producers.”

There’s plenty going on with Reno, she says.

“She has a lot of layers. She has a seductive side, a loud, obnoxious side and then, in ‘I Get a Kick Out of You,’ she has this sensitive, loving side where she wants to fall in love with someone and not just get around,” Nash says.

Freshman William Heffner, 14, plays the comic relief as Moonface Martin, Public Enemy No. 13, who ends up aboard the London-bound SS America with his fellow gangster, Bonnie.

“He aspires to be Public Enemy No. 1, but he’s really a washed-up crook,” says Heffner, who lays on a thick accent for the role.

When Moonface tries to cheer up the lovelorn Billy Crocker – who is pining for his newly engaged ex-girlfriend, Hope Harcourt – he does it in the only way he knows how, singing the song “Bluebird,” which includes advice from his criminal mind:

“When you know you’re headed for the jailer.

Don’t allow the old face to look paler

But be like the bluebird and sing Tweet, Tweet,

Tra la la la la la.”

Heffner says playing a hardened criminal singing and tweeting like a bluebird – with a thick New York accent – is all fun.

And never boring.

‘Anything Goes’
Where: Scarsdale High School, 1057 Post Road, Scarsdale.
When: Tonight and tomorrow at 7:30 p.m., Sunday at 2 p.m.
Tickets: $15, $10 for students and seniors.
Call: 914-721-2484.
With: Steven Klein, Brian Morabito, Zach Edelman, Ben Weinstein, Spencer Migotsky, Michaela Pavia, Becca Edelman, Greg Seiden, Gracie Nash, Michael Strauss, William Heffner, Andrew Wang, Oliver Roth, Margaret Gondolfo, Frank Berman, Andrew Feyer, Adam Sperber, Lucy Fink, Caroline Salis, Reana Sheth, Fiona Begg, Hallie Calderwood, Becca Zipurski, Diana DiMartino, Monica Rejan, Lorna Begg, Sarah Coffey, Rebecca Erde, Mara Goldstein, Caitlin Hayes, Morgan Hecht, Stephanie Melnick, Ali Meyer, Julia Rotkovsky, Santina Scarcella, Jordan Thaler, Jamie Ballan, Ilana Bookner, Sonaktshi Bose, Lilly Claar, Justine Geifman, Lauren Gutterman, Autumn Hamra, Hannah Harris, Elisabeth Huh, Rachel Natbony, Hale Rauch, Kathleen Rooney, Hanna Schwartzbam, Sara Sherman, Holly Sauchack, Cara Scharf, Rachel Shore, Amy Shuler, Sarah Warshowsky, Catherine Tan.