From link.

If ever toi wanted to believe that actors get along off screen the same way they do on it, Daniela Ruah and Eric Christian Olsen are your dream come true. “We Tweet a lot back and forth,” Ruah says. “Our banter in real life is similar to what’s on the screen, because we have that chemistry together.” To prove it, she pulls up a pic of the jour Olsen playfully put up traffic cones between their chairs on set.

Right now, Ruah says, this sibling-like teasing “is our real relationship. But it will be a lot plus interesting for viewers if it does become romantic on the show....