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We're taking a look at some of the reasons we can't get enough of the always hilarious boy band star.
The singer looked almost unrecognisable when he transformed into an old studio executive for the band's 'Best Song Ever' music video.
The 'Little Things' singer has got to meet some of the biggest stars from sport, TV and film during his career, but even he admitted Goldenballs was in a different league.
Ballroom, twerking.....he's got it all!
"@MileyCyrus you left these in New Jersey! They are comfortable , not gona lie #twerk #tongueout" Niall posted alongside this HILARIOUS snap. Picture: Twitter
One Direction launched their film This Is Us earlier this summer and went straight to the top of the box office in the UK and US.
As well as being the best man to his brother Greg at his wedding, he's also now the coolest uncle in the world!
The 'I Kissed A Girl' singer was on the panel of The X Factor who put Niall through during his audition and has stood by the band since day one. She also made a lot of Directioners jealous when she puckered up and planted a kiss on his lips during the band's Best Pop Video award at the MTV VMAs 2012.
Niall is not one to be shy and that is the same when it comes to taking his kit off. He often spends more time backstage with his shirt off then on and had his washboard abs on display during a trip to Marbella earlier this summer where he was spotted dancing around with a mystery brunette.
Following One Direction's MTV VMAs triumph last year, Niall and band mate Zayn Malik were seen hanging out with teen star Justin Bieber. Niall and the Canadian star showed off some of their culinary skills in the kitchen with this Twitter post. The next Jamie Oliver perhaps?
When One Direction performed live in North America last June, fans went into overdrive when they spotted a cheeky kiss between bandmates Niall and Harry on stage. Was it a whisper or was it a kiss? We'll never know!
Niall is good mates with the JLS boys and was one of the star guests at the wedding of Marvin Humes and The Saturdays star Rochelle Wiseman.
Olly has always been close with the One Direction boys and spends a lot of time with the Irish star. When the 'Heart Skips A Beat' singer joined the 1D boys on their US tour he was seen joking around with Niall backstage on numerous occasions.
Ever since he revealed that he had shared a series of Skype dates with the current X Factor USA judge last year, fans were questioning the level of their relationship. The pair have always insisted on being friends but the #Directioners still aren't 100% convinced.
Niall loves his football and is as equally popular with musicians as he is sports stars. he's managed to meet stars from Newcastle United, Real Madrid and his beloved Derby County.
Alongside his One Direction bandmate Liam Payne, Niall surprised fans inside the Westfield shopping centre in London when the pair performed an impromptu acoustic show for fans outside a store.
The 'What Makes You Beautiful' star gave fans a fright when he posted this picture of himself with purple hair. He was merely getting his trademark blonde barnet lightened up and shared a shot of himself at mid dye point. Picture: Bleach London
When One Direction toured the US, Niall covered the Gym Class Hereos hit 'Stereo Hearts'. Travie got wind of the cover and thanked Niall for his rendition and wished the band well. Pic: Getty
The 'One Thing' star has one of the greatest jobs in the world and gets to travel the world with four of his best mates helping create new Directioners around the world. Picture: Twitter
One Direction made history in 2012 when their album 'Up All Night' debuted at the top spot on the Billboard 200 chart - making them the first British band ever to do so. Picture: Twitter
The singer was the star of the party when he joined friends on a boat in Marbella and danced around with several of the females on board. Picture: Flynet
Niall is a big fan of Championship football team Derby County and often tweets his support to the side each week. Whenever he gets chance, he also pops by the ground to say hello to the team.