Laura Prepon is pregnant

Laura Prepon is pregnant with her first child.

The 36-year-old actress – who is engaged to actor Ben Foster, also 36, – is expecting a baby with her fiancé, a source close to the couple has confirmed to PEOPLE.

And the pair sparked speculation a baby was on the way when Ben was "really protective" of Laura at the Creative Coalition’s Spotlight Initiative Gala Awards Dinner, which was held at the Kia Supper Suite, Utah, during this year’s Sundance Film Festival on Sunday (01.22.17). Ben was seen assisting Laura as she walked around at the star studded event.

Speaking about the duo, a source said: "Ben seemed really protective and kept very close to Laura the entire night. He was holding onto her arm as they walked in and kept by her side during the dinner.

"Neither of them got up much to mingle. They definitely enjoyed dinner. I noticed she finished her plate."

Meanwhile, the ‘Orange Is The New Black’ star – who was proposed to in October last year – has already starting to plan their nuptials and admitted she wants a "really small wedding".

Speaking previously, she said: "We want a really small wedding but we have a lot of people that we love and care about.

"It’s weird, [but] apparently doing the list for your wedding is a whole thing that could cause some issues. [The ‘Orange is the New Black’] cast alone is like 50 people."

But Laura has admitted their respective work commitments are making it difficult to set a date.

She explained: "He’s going off to do two movies. I just wrapped last week. It’s just, you know, scheduling. It’s a lot."