'Outlander' Star Laura Donnelly Explains Her Sibling Chemistry With Sam Heughan

The “Lallybroch” episode of Outlander was a reunion for Jamie (Sam Heughan) and his sister, Jenny (Laura Donnelly), but the show itself is a reunion for the actors, who attended the Royal Scottish Academy of Music and Drama together. “I think that everybody in our college knew that Sam [was] probably going on to be some kind of TV heartthrob,” Donnelly said when she recently visited Yahoo TV. “I think that was in his DNA.”

Related: 'Outlander’ Postmortem: A Look at Bringing Lallybroch to Life

“The relationship that Sam and I had already had really helps with the relationship between Jenny and Jamie, I think,” she continued. “We’ve known each other a long time, we’re very comfortable with each other, we have a lot of fun, and we can rib each other a bit in the way that only people you’ve known for a long time — friends and family — can actually do.”

Related: 'Outlander’ Stars Talk Corsets and Kilts

Donnelly also spoke about the joys of wearing her pregnancy costume and named the biggest prankster she encountered in the close-knit cast.

Outlander airs Saturdays at 9 p.m. on Starz.