The buzz has it that "Outlander" stars Sam Heughan and Caitriona Balfe are dating. The duo's on screen chemistry has sparked off rumours if they are seeing each other.

The actors have claimed on several occasions that they were single but they sent out hints that they are more than just co-stars and friends by getting cosy during their public appearances. They added mroe fuel to the fire with their nerve-wrecking romantic scenes in the series.

"A single lady right now and terribly depressed by it... joke. Had I been in a relationship, it would've been difficult to leave someone in LA. But I don't worry about it too much. Leave that up to my mother," Independent qouted Balfe's statement to Weekend Magazine.

Balfe had earlier dated Radio4 Guitarist Dave Milone for a long time before breaking up for unknown reason. Since then, she has maintaining that she is single.

Though it still remains to be confirmed whether Heughan and Balfe are dating, the former said in one his interviews that the makers of the show auditioned a slew of girls for the role of Claire but chose Balfe.

"We just knew straightaway that she was the right one. We just started chatting in the test before we started the audition, and we just seemed to get on. Her humor is fantastic. She's great fun to work with. She's very hardworking, a wonderful actress, very natural. It's been really fun to see where the relationship goes between us. We didn't make any overly complex decisions on our characters' relationship. We just wanted to see where the story has taken us. So far, it's been a real journe," Heughan told about his chemistry with Balfe to Inside TV.

"Outlander" was first premiered on Starz on 9 August. The show based on the novel written by Diana Gabaldon has already been renewed for second season.

The show produced by Left Bank Pictures and created by Ronald D. Moore is about a former Army Nurse Claire Randall who secretively travels back in time. She goes from 1945 to 18th century Scotland. In her quest, the only person who wants to keep her safe is Jamie Fraser played by Heughan.