Britney Spears lets it slip that friend Zoe Saldana is pregnant with twins

has confirmed that her friend

is

. The singer

during an interview with

on Tuesday.

© Photo: Getty Images

Asked whether she and her

co-star Zoe would do another film together, Britney replied, "Who knows? That’s a very good idea.

. So I’m sure she’s got a huge future ahead of her."

star Zoe, 36, has been considerably less vocal about her pregnancy.She sparked reports that she was expecting his first child with husband Marco Perego

, where she showed off her little baby bump, and the following day her spokesperson

.

It was then

when she gives birth, thought to be around January. But until now, there has been no confirmation.Zoe is notoriously private when it comes to her personal life. She married Italian artist Marco in secret in June, but didn’t

until six months later, during a December appearance on Jimmy Kimmel Live.

© Photo: Getty Images

Until then there had only been

that Zoe,

, had married Marco. "

," a source told

in September, adding that the couple had "known each other for a long time" and had "great chemistry".