The One Direction star was among the thousands who attended the open air music festival in Hyde Park on Friday (08Jul16), but all eyes were on him and his date for the gig, recent college graduate Celine.

In photographs published by the U.K.'s The Sun, Niall was caught putting his arm around Celine as the rumoured couple took in a set by Mumford & Sons. In subsequent snaps they share a kiss, while he pecks her on the cheek.

A source tells the newspaper the pop star was clearly smitten with his new girl, saying "Niall never let Celine out of his sight and looked infatuated. He had his arm around her throughout the evening and kept going in to peck her on the cheek while they watched the gig.

"They seemed incredibly happy in each other’s company, laughing and giggling loads. At one point Niall kissed her in front of everyone and obviously didn’t care that people were watching."

The loved-up couple reportedly spent the entire weekend together and hit up London nightclub Drama on Sunday night (10Jul16). They were even snapped heading home in a taxi together in the early hours of Monday (11Jul16) morning.

Celine recently completed a degree in law at the University of Exeter in the U.K.

The Irish heartthrob, 22, was previously linked to singers Ellie Goulding and Selena Gomez, and Australian model Melissa Whitelaw.