Actor Nikolaj Coster-Waldau, the man who plays Jaime Lannister in HBO's popular television series Game Of Thrones, has been spotted in Hobart, where he has spent time taking in the city's cafe and art scene.

Numerous sightings of Coster-Waldau, known in the show as the Kingslayer, caused a social media frenzy, with locals tagging their posts about the actor #GOT.

Josie Sibly was working at the coffee shop this morning when she noticed the Danish heart-throb walk in and order a skim latte.

"He walked through the front door and I kind of had a little bit of a moment and was just like, 'oh my gosh, he's here', and got a bit starstruck, got a bit nervous," she said.

"I don't think many other people in the cafe realised at the time who he was."

The 21-year-old barista has read all the books, penned by author George RR Martin, on which the Game Of Thrones television program is based.

"I do really, really like it, so it was a big thing when he walked through the door," she said.

"I was finding it hard to string my sentences together, trying to be vaguely normal and asking him about what he was doing."

The pair discussed Coster-Waldau's visit to Hobart's Museum of Old and New Art the previous day.

"He said he really enjoyed it," Ms Sibly said.

"He was really nice, he was a bit quiet, I think he was maybe hoping not to get noticed."

Jaime Lannister slays social media

The photo of the actor and Ms Sibly was posted on her cafe's Facebook page and quickly attracted almost 500 likes and 100 shares.

Coster-Waldau was also spotted out at the Salamanca entertainment precinct.

Fans took to Twitter and Facebook to express excitement at the celebrity's visit.

"Trust my luck to have Jaime Lannister swanning around Hobart the week I'm working out of town. Everything is terrible," @memily wrote on Twitter.

"I need to track him down," Facebook user Zac van Tienen said.

Despite the city's media putting out numerous calls to would-be celebrity spotters this afternoon, Coster-Waldau has not been seen since this morning's coffee-stop.