While it's been eight years since onscreen-lovers-turned-real-life-couple Mila Kunis and Ashton Kutcher starred together in That '70s Show, it seems that the pair's former co-stars still can't help but gush over the newly engaged lovebirds.

E! News caught up with Laura Prepon last night at the season-two cast preview for the hit Netflix series Orange Is the New Black in Los Angeles, where the 34-year-old actress shared a few kind words about her close friends.

"Yeah, I don't usually comment on my friends' personal lives," the raven-haired beauty admitted before confessing, "But they're an amazing couple."

Laura Prepon, Mila Kunis, Ashton Kutcher

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An amazing couple, indeed, who also is notoriously private, so it's understandable (not to mention polite) that Prepon would respect her pals.

But the OITNB actress isn't the pair's only former co-star who has commented on their relationship. Kurtwood Smith, who played Red Forman on the hit show, previously called their romance "amazing," telling E! News in November, "They're both great people, so I'm happy for them."

And he even foreshadowed their engagement!

"Maybe they should get married," he said with a laugh. "We'll all go to the wedding and that could be the reunion. It'll be a reality show."

Not a bad idea. Kelso and Jackie forever!

Mila Kunis, Ashton Kutcher

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The engaged twosome most recently attended Mila's uncle's birthday bash on Saturday evening at the Premier Russian restaurant in Studio City, Calif., where they were spotted dancing up a storm and engaging in some PDA.

And last week, they were spotted enjoying a double date with Kutcher's costar Jon Cryer and his wife, Lisa Joyner.

Kunis is also set to make a guest appearance alongside her man on Two and a Half Men, so fans of the couple can finally see the two back onscreen together!

As for Jon Cryer's opinion of the beloved pair? Dare we assume he thinks they are amazing as well?! (Safe to say it's a solid conclusion).

PHOTOS: Ashton Kutcher & Mila Kunis: Romance Rewind

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