Laura Prepon is off the market!

The Orange Is the New Black star is engaged, and he happens to be another talented Hollywood actor.

Ben Foster, 36, proposed to Laura, 37 — who plays Alex Vause on OITNB — in October 2016.

In January, the pair announced they were also expecting their first child together.

Just last night, the parents-to-be attended the premiere of her new film The Hero at the Whitby Hotel in NYC — and she looks like she's ready to pop!

MORE: 'Orange Is the New Black' Season 5 Looks So Good, It Should Be Illegal

laura prepon ready to pop!

(The couple attend The Hero New York premiere on June 7, 2017. Photo Credit: Getty Images)

The low-key duo — who have known each other for almost two decades — have largely kept their relationship out of the spotlight. The actress has known Ben since she was 18 because Ben is friends with her That '70s Show co-star, Danny Masterson.

The two sparked dating rumors back in July 2016 after being seen out and about together in Cape May, NJ.

MORE: Natasha Lyonne Reveals 'Orange Is the New Black' Season 5 Is "Racking up the Intensity to 11"

A source told Us Weekly at the time that Laura “was holding onto Ben and was all over him” while they enjoyed each other’s company at the Ugly Mug pub. “They were really close, talking and laughing.”

Ben is an accomplished actor himself, starring in films like The Punisher, X-Men: The Last Stand, and Alpha Dog. He also produced the film, Rampart, about a veteran police officer who works to take care of his family and struggles for his own survival.

Congrats to the happy couple — we can't wait to meet your new bundle of joy!

Season 5 of Orange Is the New Black comes back to Netflix June 9.

More From In Touch

Watch the Orange Is the New Black Season 5 Trailer!

Check out OITNB Star Laura Prepon's Stunning Engagement Ring!

'Orange Is the New Black' Star Samira Wiley Shows off Longer Hair on Instagram