Mrs. Brady, more classic TV mothers gather on 'Instant Mom' -- PHOTOS

Instant Mom isn’t going the flowers-and-brunch route to celebrate Mother’s Day next month: The Nick at Nite comedy has signed up classic TV matriarchs Florence Henderson (The Brady Bunch), Marion Ross (Happy Days), and Meredith Baxter (Family Ties) to guest-star in its May 8 episode. To sweeten the cookie jar, they’re also including Jackée Harry — who played Instant Mom star Tia Mowry-Hardrict’s adoptive mother on Sister, Sister — as well as a famous TV daughter, Tempest Bledsoe (The Cosby Show).

You can sneak your first glimpse at the mother of all Instant Mom episodes in the photos above and below. What brings everyone together in robes? Stephanie (Mowry-Hardrict) is taken on a spa day by her mom, Maggie (Sheryl Lee Ralph), after experiencing an underwhelming first Mother’s Day, and in the sauna, she encounters the women, who wind up coyly referencing their classic characters.