EXCLUSIVE: Shirley MacLaine Can't Stop Cradling Amanda Seyfried's Baby Bump at 'The Last Word' Premiere

The 82-year-old actress gushed to ET about her pregnant co-star at their film's Hollywood premiere.

Oh, baby!

During Wednesday night's Hollywood premiere of her new film, The Last Word, Shirley MacLaine could not get enough of co-star Amanda Seyfried's baby bump.

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As MacLaine stuck close to Seyfried's side, the mama-to-be joked to ET's Lauren Zima that she was "12 months pregnant."

"I'm ready," the 31-year-old actress admitted, to which MacLaine added, "Like any minute."

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WATCH: Amanda Seyfried's Fiance Thomas Sadoski on Her Pregnancy: 'She's Already an Incredible Mom'

Seyfried met her fiancé, Thomas Sadoski, while filming the movie, and MacLaine couldn't help but gush about the on-set romance.

"Absolutely the best! I watched their love affair, and I watched the baby almost being conceived," MacLaine, 82, quipped. "To watch the two of them together... they're truly in love."

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ET also spoke with Sadoski at the premiere, and naturally, he was just as enamored with his bride-to-be as MacLaine.

"I'm blown away by her every day," he admitted.

Though the pair didn't reveal the due date or their baby's gender or name, the 40-year-old actor did say that he's getting ready for fatherhood with a whole lot of preparation -- and by letting his lady lead the way.

"She does look about ready to pop. It's a pretty amazing thing. I just get to sort of hang back and watch it all happen," he added. "That's the great joy for me, trying to learn as much as I can -- try to stay out of the way and not screw anything up too much."

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Seyfried and Sadoski announced their engagement in September and the pregnancy two months later.

For her latest red carpet turn, Seyfried opted for a black Chloe dress with mint green-and-white floral embroidery, which she paired with gold drop earrings and a bold red lip. To see even more gorgeous pregnancy styles from your fave celebs, click through the gallery below.