Paul Mescal Supports Girlfriend Gracie Abrams During N.Y.C. Concert: 'They're Going Strong' (Exclusive Source)

Paul Mescal is definitely a Gracie Abrams fan.

On Saturday, Oct. 5, the Normal People actor, 28, was spotted at Abrams' concert at Radio City Music Hall in New York City to support her. He danced and sang along during her performance. A source tells PEOPLE that "they're going strong."

PEOPLE reached out to representatives for Abrams for further comment. A rep for Mescal declined to comment.

The couple first sparked romance rumors in June after TMZ published photos of them having lunch together in London. Following that outing, Mescal and Abrams, 25, were spotted together again in London — this time holding hands — per Deuxmoi and the Daily Mail.

A mid-August outing seemingly confirmed their romance , as Abrams was seen playfully taking a bite of Mescal's hand while they strolled through London. A source for PEOPLE also said at the time that "they've been hooking up and it's still early stages."

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The "Close to You" singer and the Gladiator 2 star attended the All Points East Festival in London in August. Mescal was seen cuddling Abrams at the show in Victoria Park while they enjoyed Mitski's performance.

They were joined by Mescal's Normal People costar Daisy Edgar-Jones and her boyfriend Ben Seed .

The Radio City Music Hall show was part of Abrams' The Secret of Us tour, which is slated to make stops in Boston, Philadelphia and Portland, Ore., before Abrams rejoins Taylor Swift on the final leg of her Eras Tour.

Abrams previously spoke to PEOPLE in January about her experience touring with Swift, 34. "Being a part of that tour in a tiny way has changed the course of my life in so many ways," she said.

"She's just the most unbelievable performer and the most generous friend," Abrams continued. "It's not lost on me that her belief in me has really just...done a lot. So I'm deeply grateful to her, forever."