"I can't believe it!" she added. "It’s so nice to be able to talk about it and share it."
This marks the first child for Swank, who has been married to entrepreneur Philip Schneider since 2018.
Watch Swank announce the exciting news in the clip, above.
Meanwhile, the "Million Dollar Baby" star also shared the pregnancy announcement on Instagram, revealing the first look at her growing bump. Swank posted a moving animation that featured several photos of the mom-to-be cradling her belly.
"Coming soon…DOUBLE feature! 👼🏼👼🏼," she captioned the post, below.
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"I'm feeling great right now, even with the time -- you know, I'm on Pacific time, so I'm a little cross-eyed because of that. But I'm feeling good right now," she told Kelly Ripa and Ryan Seacrest.
"It's so fun to actually, finally be able to say it, to get past the 12th week and be able to say, 'I'm pregnant!'" she continued, sharing that the crew of her new show "Alaska Daily" didn't know she was expecting "until now."
"But my clothes started not to fit so I had to, the other day .. cut [my jeans] open. And then I put a jacket on that wasn't in continuity," Swank said. "And [they] came and said, 'That's not in continuity.' I said, 'Oh, I think it works.' 'It doesn't.' 'No, it does. I'm going to make it work.' She's like, 'If you're an executive producer, you can do it, but this is weird.'"
The "Next Karate Kid" star also shared that twins run in her family -- as well as her husband's!
"My grandmother was a twin. My husband's grandmother was a twin," Swank said, "So we have twins in our lineage."
"It's such a blessing. It's a total miracle. It's unbelievable," she added.