Hey, what’s the big idea?

Roomy cotton tees for mommies-in-waiting by 9Seed. Designed by the Citizens of Humanity maternity collection team, the new local line has you looking swell while you, er, swell.

Asymmetrical hemlines on the Dew scoop-neck conceal a growing rear end. The extra-long Pixie tank guards against a peek-a-boo midriff. Breezy bell sleeves that hit above the elbow make Wood Nymph a go-to for hiding blubber arms. As a whole, the super-soft line comes in easy-to-wear colors (gray, black, blue, green, white, charcoal) and everything is refreshingly spandex free.

Go ahead and let loose.

Available starting Friday at Xpecting, 369 17th Street, between Raymond and Tustin Avenues, suite 20, Costa Mesa (949-574-2184 or xpectingmaternity.com); online at duematernity.com. To see styles, go to nineseed.com.

SEE
A Year with Frog and Toad
What: Tony-nominated production follows the woodland adventures of Arnold Lobel’s beloved amphibious characters as they learn the value of friendship.
Why: Ribbiting entertainment.
When: Thurs., at noon.
Where: Thousand Oaks Civic Arts Plaza, 2100 E. Thousand Oaks Blvd., at Zuniga Ridge Pl., Thousand Oaks (805-449-2787). Tickets online at fieldtrips4kids.com.

LEARN
It’s Tortilla Time
What: Discover the history behind everyone’s favorite taco holder and how to make them from scratch.
Why: It’s a wrap party.
When: Sat., 10 a.m.-noon. Register by 5 p.m. today.
Where: The Arboretum, 301 N. Baldwin Ave., at Arboretum Way, Arcadia. To register, call 626-821-4623 or 626-821-5897.

HEAR
Second Annual Grammy Children’s Music Celebration
What: All six nominees for best kiddie album of ’09, including Milkshake and Ziggy Marley, put on a rocking show.
Why: It’s a Gram slam.
When: Sat., noon.
Where: The Grammy Museum, 800 W. Olympic Blvd., at Figueroa St., ste. a245, Downtown (213-765-6800).

Photo: Courtesy of 9Seed