October 14, 2014 06:30 PM

Call it déjà vu: Zoë Saldana‘s world is about to turn blue.

The Avatar actress is expecting twin boys with her husband Marco Perego, PEOPLE confirms.

“She is beside herself happy over it all,” a source says of Saldana, who attended The Book of Life premiere in an Altuzarra printed dress from their spring line.

Saldana, 36, and Perego have been preparing for the pending arrivals and were recently spotted stocking up on essentials for their sons at Bel Bambini.

Jeffrey Mayer/WireImage

And although the mom-to-be has remained mum throughout much of her pregnancy, she recently hinted that she is experiencing double the joy, joking she would need to triple up on her Halloween costume collection.

“I might have to make some adjustments,” the Guardians of the Galaxy star said.

E! Online reported the news Monday.

GALLERY: Zoë Saldana’s Fierce & Flowing Bump Style

For more on Saldana’s pregnancy style, pick up the latest issue on PEOPLE, on newsstands Friday.

— Anya Leon with reporting by Jennifer Garcia 


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