Niall was spotted backstage at her show in a number of pics that surfaced online, but afterward they went to hang at an after party at London club Cirque Du Soir.
Before the Ariana and Niall dating rumors heat up, however, the pair left the club separately in the early hours. Things got so crazy at da club though that the fire department had to be called. Well, probably not because of the lovefire burning between Ariana and Nialler – the club had to close because of an electrical problem.
Ariana later posted videos of her, Niall and friends sucking helium out of balloons. Goals. She captioned it: "new friends + old friends + helium balloons @lexie1225 @alfredoflores @niallhoran @chantelgonsalves"
Niall posted a video from the concert on Instagram, writing: "This girl blew me away! She has the most incredible voice I've ever heard! Superstar." Aw! Niall's an Ariana fanboy.
Niall and Scooter Braun backstage at Ariana Grande's concert last night in London pic.twitter.com/SkHO4jHpUI— Everything 1D (@Go1DenUpdates) June 2, 2015
One Direction Manila (@1DInfectionMNL) June 2, 2015
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Gallery | One Direction's Instagram: Best of Niall Horan