Beyonce: "Our family will be growing by two"

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NEW YORK (AP) -- Blue Ivy is about to become a big sister -- twice.

Beyonce and her husband, Jay Z, announced Wednesday on Instagram that the superstar singer is pregnant with twins.

"We are incredibly grateful that our family will be growing by two," said a statement signed "The Carters." The news accompanied a photo of Beyonce showing a baby bump while wearing just a bra, underwear and a veil.

The couple welcomed their daughter Blue Ivy into the world back in January of 2012.