Niall and Barbara were allegedly spotted together in a 5 Seconds of Summer concert.

Photos of the rumored couple taken by fans were posted on Tumblr and made their way to Twitter via @UpdateWith5SOS. The 5 Seconds of Summer fanbase tweeted, "Niall Horan and Barbara Palvin at the 5SOS concert tonight! (I found this photo on tumblr so credit to owner) x"

The 1D member and the Hungarian model were seated quite close to the Aussie band's stage, based on the above fan photo and from Barbara herself! The VS model actually posted a photo of the band from her seat on Instagram, saying, "was so happy to see @5SOS perform tonight! finally!!"

The alleged pair's concert date comes after Nialler was rumored to have spent a date night with Sel in London. A photo of the 1D member cuddled up to a couple of fans and Selena Gomez has been uploaded on Twitter, sparking rumors between the two.

The "Nelena" photo also had rumors flying that Nialler and Barbara might have called it quits. But the recent concert date plus JB's controversial "most elegant princess in the world" post might just prove otherwise.

The 1D member and the Twin-set Simona Barbieri model were first rumored to be dating last year when Louis Tomlinson's younger sister spilled the beans but neither really admitted their alleged relationship.

13-year old Félicité "Fizzy" Tomlinson reportedly told a fan, "I haven't asked him if they're dating but when I was at X Factor Alberto from security said Niall's girlfriend Barbara was here. Liam said everyone has girlfriends here tonight except Harry so yeah they're dating," Hollywood Life notes in an earlier report.

The concert date is also not the couple's first public outing. The two first appeared to went on a movie date, watching 'Hunger Games: Catching Fire' after which Barbara called on to the 1D member on Twitter saying, "Hunger games buddie."