Louis Tomlinson got ''flirty'' with a mystery brunette at Glastonbury.

The 23-year-old One Direction star enjoyed his first time at the Worthy Farm festival with his fellow band member Niall Horan, and got close to the girl while watching The Libertines' surprise gig, and even put his hand on her bum at one point.

Speaking to The Sun newspaper, an onlooker said: ''They were very flirty and clearly knew each other.''

Earlier in the day, Niall and Louis were seen drinking beers and watching James Bay perform at the Pyramid Stage.

Niall was overheard saying: ''I'm going to get on it.''

According to reports, security has been upped near the Winnebagos at the festivals, because it has been reported that the 'Story Of My Life' hitmakers are staying there rather than camping.

While some festival-goers were getting excited that One Direction might be performing a surprise set at Glastonbury, a rep for the boyband denied they would be performing at the famous music festival, as the boys are making their way to Helsinki today (27.06.15) to perform a concert tonight.

Meanwhile, former 1D member Zayn Malik - who left the group earlier this year - was earlier this week pictured in Paris with tonight's headliner Kanye West, sparking rumours that he may be performing with him on stage tonight.