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Tamera Mowry, Adam Housley

Ethan Miller/Getty Images

Tamera Mowry-Housley will soon be joining her sibling, Tia, on diaper duty.

The Sister, Sister star and her husband, Adam Housley, are expecting their first child together.

"I'm so excited! I really am," Tamera, 33, told E! Online's sister site, MyStyle. "I found out about three months ago that I was pregnant. Honestly, Adam and I were in the 'whatever happens, happens' mode. Now, we are expecting a baby in November."

Not surprisingly, Tia couldn't contain her excitement when the news was finally made public today, tweeting, "yay! This is the hardest secret I have had to keep! But it's out!!!! I am gonna be an auntie!!!!!!!!!! OMG! Cree is gonna have a cousin!"

The big announcement comes just 10 months after Tia became a first-time mom herself with the arrival of a baby boy last June.

The second season of the sister's Style Network show, Tia & Tamera, premieres on June 11.

(E! and Style are both part of the NBCUniversal family.)