Sam Heughan and Caitriona Balfe's on-screen chemistry is really off the charts, making the fans wonder if they are more than just a "reel" couple. Ever since "Outlander" began, rumors of their romance began circulating and even though they have been denying the rumors, fans find it hard to dismiss. Filming for "Outlander" season 3 recently wrapped up and the cast and crew had a party to celebrate the smooth run of the show. It was also a perfect time for the cast and crew to unwind and get some much-needed fun and relaxation. During the party, Sam Heughan and Caitriona Balfe were Jamie and Claire no more.

However, some photos taken during the party revealed that the lead stars of the series may have been experiencing a hangover from filming.

Why is this so? According to Entertainment Tonight, photos revealed Sam Heughan and Caitriona Balfe were seen having some fun in a hot tub with a cold beer in hand. It was definitely a refreshing sight to see the "Outlander" season 3 actors dressed down and just lounging around. With no cameras rolling, the smiles and laughter of the on-screen couple showed a different side of them, which in turn, reignited rumors that they are more than just colleagues.

Social media game strong

The power of social media is quite strong lately, and it has affected celebrities in more ways than one.

A few years ago, celebrities suspected to be dating only has to admit or own up to their relationship via a talk show, a magazine interview or through a radio or TV guesting.

However, in this age of social media, celebrities can take the matters into their own hands or tease their fans about a possible relationship through their social media accounts.

That said, it looks like Caitriona Balfe is either playing with the fans or trying to send a message about her and "Outlander" co-star, Sam Heughan.

The 37-year old actress took to Twitter to give the fans a glimpse of how the "Outlander" season 3 wrap-up party went down. Although the post might seem to be just a normal photo for Caitriona Balfe, the fans who ship her with Sam Heughan were already over the moon.

Looking very much like a happy couple

The hot tub photo featuring the "Outlander" stars in a hot tub was actually posted by Caitriona Balfe herself. This has led fans to wonder whether it's just a normal post by the actress or was she trying to imply something - trying to drop a hint that she and Sam Heughan might actually be more than just co-stars or friends.