Niall Horan has split up with his girlfriend.

Niall Horan

Niall Horan

The One Direction star has reportedly called time on his relationship with Australian model Melissa Whitelaw after struggling to make it work long distance.

The pair met while the 'Kiss You' hitmakers toured Down Under in February and while they still enjoy each others company it is thought they have now decided just to be friends.

A source told The Sun newspaper: "Niall and Melissa did well to keep their romance low-profile during their time together.

"They were really close and had fun whenever they went out together.

"But realistically they always knew it was going to be tough, keeping a relationship going with such distance between them.

"He now intends to focus totally on the band."

The 21-year-old singer has since been spotted partying in London with pop princess Ariana Grande.

The 1D heartthrob joined the brunette beauty backstage after she performed at the O2 Arena before the pair headed to Soho night spot Cirque De Soir where they partied until the early hours of Tuesday morning (02.06.15)

Niall was also recently spotted partying with Little Mix's Jade Thirlwall and enjoyed a night out with Lauren Jauregui, who is a member of pop group Fifth Harmony, on Sunday (31.05.15).