Niall Horan enjoys a night out in London without his One Direction band mates

Someone's having a great time! Niall Horan enjoys a night out in London without his One Direction band mates

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UPDATED:

10:44 GMT, 11 August 2012

He's one fifth of one of the world's most popular boy bands, yet last night Niall Horan decided to go it alone.

The 18-year-old singer enjoyed a night out at celebrity hotspot Funky Buddha without his fellow band mates, but he didn't seem to be missing them.

As he helped two of his friends celebrate their birthdays, the Irish star was grinning from ear-to-ear and clearly loving his solo night out.

Having a great time: Niall Horan has a laugh outside Funky Buddha last night without his One Direction band mates

Having a great time: Niall Horan has a laugh outside Funky Buddha last night without his One Direction band mates

Someone's perked up! The 18-year-old arrived at the club looking glum but was giving a thumbs up by the end of the night (L)

Someone's perked up! The 18-year-old arrived at the club looking glum but was giving a thumbs up by the end of the night (L)

Someone's perked up! The 18-year-old arrived at the club looking glum but was giving a thumbs up by the end of the night (L)

Niall had dressed rather casually for a Friday night out wearing blue skinny jeans, white trainers and a T-shirt that was decorated with a bowler hat, a moustache and a bow tie.

When he arrived at the London nightclub earlier on, Niall looked rather serious and refused to smile for the cameras but fast forward a few hours, and perhaps a few drinks later, and he was in a very jolly mood.

Before posing with a few female fans, the blonde singer enjoyed a special moment with his smartly-dressed friend who seemed to be celebrating his birthday.

Calm down! Niall appeared to be very excited as he screamed with a friend outside the club

Calm down! Niall appeared to be very excited as he screamed with a friend outside the club

Bromance Niall was helping his friend celebrate his birthday

Bromance Niall was helping his friend celebrate his birthday

The pair were seen hugging one another while Niall screamed in his face and gave a thumbs up to the camera.

Niall partied until the early hours of this morning, but made sure he took a quick visit to Twitter before getting into bed.

'Great time at @JoshDevineDrums and @JoeyCottle 's birthday party! Home now! Bedtime,set for the final tomorrow! Cmon @johnJoeNevin ! Hero,' he wrote.

Give us a hug! The Irish star and his friend were showing their love for one another as onlookers watched them

Give us a hug! The Irish star and his friend were showing their love for one another as onlookers watched them

Meanwhile, his band mate Harry Styles was celebrating someone else's birthday in Soho.

The 18-year-old singer was spotted arriving at Nick Grimshaw's birthday party where his ex-girlfriend Caroline Flack was also in attendance.

Party animals: Elsewhere Harry Styles was celebrating Nick Grimshaw's birthday in Soho

Party animals: Elsewhere Harry Styles was celebrating Nick Grimshaw's birthday in Soho