It’s the stuff of soap operas and romantic comedies: twins separated at birth stumble upon each other and dubious drama or madcap antics ensue. But for Samantha Futerman and Anais Bordier, real-life twins who were raised on different continents, the reunion has brought nothing but joy.

"That feeling on Christmas when you open up the presents, the one you were asking for, it's that; that pure feeling of joy ... that's how I always feel," said Futerman, describing what it has been like to discover she has a sister.

The story began 25 years ago in Busan, South Korea, where the sisters were put up for adoption. Futerman grew up in the U.S. and became an actress living in Los Angeles; Bordier grew up in France and went on to become a fashion designer in London.

The chance that they might stumble upon one another by accident seems unlikely at best; but when Bordier saw her doppelganger on a YouTube video, the wheels were set in motion and the rest, as they say, is history.

"On February 1st, 2013, I got a message on Facebook from a girl in London," Futerman recalled. "It said she had seen me in a YouTube video, then after looking my name up online, saw that we were both adopted, and born on the same day, in the same city. When I saw her profile, it was crazy. She looked just like me."

"When I looked at the video, I … it was, like, shocking," Bordier said. "You can't imagine that you might have a twin sister somewhere that you don't know about."

The Facebook message led to a three-hour Skype chat, which led to a reunion in London and two more in Los Angeles and New York City. Upon their first encounter, Bordier poked Futerman's head to make sure she was real.

And just to be sure, the sisters had a DNA test to prove what they already knew; the results were positive — twins, separated at birth.

Bordier told "Good Morning America" that she always had a sense that something was missing in her life, even though neither of the girls knew they had a sister who was placed in another foster care agency.

"I did feel like I missed something," Bordier said. "I had an imaginary friend when I was a kid. It happens to a lot of kids, but I had an imaginary friend and she was called Anne."

When asked how the event had changed her, Bordier replied, "I think I feel a lot more confident knowing. It's like, yeah, I've found my second half back."

The sisters plan to make a documentary about their remarkable experience, and you can follow along the journey on their Facebook page.

Watch an interview with the sisters on ABC News in the video below:

Related stories on MNN:

Twin sisters separated at birth find each other by chance 25 years later
A random YouTube video leads to the reunion of two sisters who grew up 5,000 miles apart.