Amal Clooney, a human rights lawyer, is due in June.

George and Amal Clooney
George and Amal Clooney attend the premiere ff Disney's "Tomorrowland" at AMC Downtown Disney 12 Theater on May 9, 2015 in Anaheim, California.
| Credit: Frazer Harrison / Getty Images

Oops! Nina Clooney is so excited about being a grandma to twins that she accidentally spilled the beans on the gender of George and Amal's unborn babies. Can you blame her?

Just one week after her actor son and his wife announced that they were expecting twins, mama Clooney revealed that Amal was pregnant with both a boy and a girl. "It will be one of each! Yes, a boy and a girl. That's what I've been told," she told Vogue. "How marvelous! My husband and I are extremely excited."

Amal, a human rights lawyer, is reportedly due in June. The twins will be the third and fourth grandchildren for George's parents, who are already grandparents to the actor's sister Adelia Zeidler's son and daughter.

George, a Kentucky native, often stated publicly that he would never get married or have children. He began to sing a much different tune, however, around the time he married Amal in 2014. Since then, he's been very open about how she changed his life.

"All I know is that it sort of changed everything in terms of what I thought my future—my future personal future—was going to be," he told People of marriage in 2015. "I've always been an optimist about the world. I wasn't always completely optimistic about how it was going to work out personally for me. But now I am."