Pop star Joe Jonas and Game Of Thrones actress Sophie Turner have sparked rumors of a new romance.

Joe and Sophie were reportedly spotted kissing while attending a Kings of Leon concert at the Oude Luxor Theater in Rotterdam, Netherlands on Saturday (05Nov16), on the eve of the MTV Europe Music Awards.

"They were really close together," eyewitness Anne Charlotte tells People.com. "I didn't look very often because I was seated more in front of the room. The two or three times I was watching they were kissing. She was all smiley and he looked really sweet."

The onlooker adds, "They seemed pretty comfortable. That's what surprised me."

Joe's DNCE bandmates were also in attendance at the gig. They performed at the EMAs on Sunday (06Nov16).

Representatives for Joe and Sophie have yet to comment on the report, but it's not the first time the two stars have stepped out together. They also enjoyed a night out for Halloween last month (Oct16), when Joe, 27, dressed up as a dalmatian, while the British actress, 20, donned pink, sequinned bunny ears for a fun photo with pals, reports People.com.

Joe is no stranger to dating in the spotlight - he has previously dated Ashley Greene, Demi Lovato, Gigi Hadid, and Taylor Swift, while he was most recently linked to Brazilian model Daiane Sodre in August (16).

Sophie, on the other hand, previously opened up about her love life to InStyle UK, admitting she has "never dated anyone who I didn't know before or who's in the industry".

"I think that's quite a conscious decision because the lifestyles wouldn't work," she explained in July (16). "This profession is so different to any other; the going away for long amounts of time - I think it would just be really difficult.

"If you meet on a job, it's amazing. You have five months together and it's incredible. Then, once it's over, suddenly one of you is shooting in Australia and the other one is shooting in Spain, and you never know when you re going to see each other again, but at least you both understand it."