Niall Horan has described the reaction to One Direction in South America as "unbelievable".
The pop star - who has been on tour with band mates Harry Styles, Liam Payne, Zayn Malik and Louis Tomlinson - was stunned by how many fans turned out to their shows as part of their 'Where We Are Tour'.
He told Irish radio station Spin 1038: "The shocking thing to us is that this is our first time in South America. We come down here and our fans have sold out stadiums for us. It gets us really excited. We've done some amazing shows, playing to 50/60,000 people a night."
The 20-year-old star is also excited to be heading to his hometown of Dublin at Croke Park where they kick off the European leg of their tour on May 23 and he insists fans have a lot to look forward to when it comes to the live production.
He explained: "It's very fun-filled, we try to have a laugh on stage and get the crowd involved, it's a must for us.
"I play guitar on nine or ten [tracks], I try and play it as much as I can. Croke is coming up in a couple of weeks and it's going to be unbelievable. It's one of the gigs that everyone is talking about, that and Wembley of course.
"They've been waiting a while since the last time we were in Dublin."
Talking about the band's worldwide success, he added: "We're all in the same boat, we're all from tiny little places, probably none of us had ever been to London. It's just unbelievable. We're baffled by it, it's just ridiculous, at my age as well, it's unreal [but] we're having a great time. The last two and a half weeks in South America, I never thought I'd get to countries like this."

Michael Fassbender says Magneto is "more Machiavellian" in 'X-Men: Days of Future Past'.
The 37-year-old actors stars as a young Erik Lehnsherr, a.k.a. Magneto, in the superhero film which will unite the casts of the original 'X-Men' trilogy with their younger counterparts from 'First Class', and insists his alter-ego has stronger beliefs now.
Talking to BANG Showbiz at the film's premiere in London's Leicester Square on Monday (12.05.14), he said: "In this film he is Magneto. He is much more singular in his beliefs and methods. He's much more Machiavellian."
Magneto was at odds with Professor X for decades however with a mutant annihilation on the cards it forces him to form new alliances and Fassbender enjoyed seeing this develop.
He added: "I just love the character. There is so much history in the character before I have arrived in his shoes. There's so much to play with, he's very complex. I love the relationship he has with Professor X."
The Hollywood hunk was joined by co-stars Ian McKellen and James McAvoy on the blue carpet.

Owen Wilson will lend his voice to kids' animation 'The Hero Of Color City'.
'The Internship' actor has signed up to star in Frank Gladst's movie about a diverse band of crayons that come alive in a little boy's room when he goes to sleep.
Jessica Capshaw has also joined the cast, which already includes Christina Ricci, Rosie Perez, Wayne Brady and Craig Ferguson, reports Deadline.com.
Wilson will play Ricky the Dragon, who timid crayon Yellow (Ricci) encounters on her journey to put a stop to two drawing's attempts to take over Color City.
The cast have also pledged their support to the Crayon Collection initiative, which aims to repurpose crayons for schools and organisations that help less fortunate children.
Wilson, Ricci and others will be voicing a public service announcement benefitting the charity.
John D. Erakilis, one of the film's producers, commented: "Our partnership with Crayoncollection.org is a dream come true. We have always hoped to educate and inspire young people with this film and now we have the opportunity benefit those in need."
Wilson will next appear in 'Inherent Vice' and 'The Coup'.

Prince Harry urged Londoners to support the Invictus Games for "inspirational" injured servicemen and women.
The young royal is backing the games which will place in England's capital between September 10 - 14 and have more than 400 competitors who made a personal sacrifice from 14 nations use the sport to encourage recovery and rehabilitation.
People will compete in nine adaptive sports in venues on Queen Elizabeth Olympic Park and Harry wants the public cheering them on.
He said: "Ultimately, this is about the men and women who have given so much and deserve our support, in their recovery, rehabilitation and on leaving the armed forces.
"In September the public has the chance to show that support in the sporting arena, where the same grit and determination that characterises these tenacious men and women and their inspirational journeys of recovery -- their invictus spirit -- will make for a great occasion.
"I know people will want to join me in cheering them on from the sidelines."
Adventurer and paracyclist Jaco Van Gass, who trekked to the North Pole with the prince in 2011, gushed about the 29-year-old royal's passion for helping the wounded
He told the Evening Standard newspaper: "Prince Harry is fantastic guy. His passion and love is indescribable.
"He really cares for the wounded and the people who served around him. It's the reason we are hosting the Games, it's all his idea, it's all his brainchild. He's the driving force behind it all."
Tickets for the Invictus Games go on sale on May 16.

Matt LeBlanc admits the 'Episodes' storyline about his weight gain was based on the reality which "stung".
The former 'Friends' star recalls the moment he was caught off-guard while relaxing poolside when a photographer took images of him which were later published and he admits these pictures hurt his feelings.
He explained to The Sun newspaper: "The stuff we did last year [on Episodes] about me getting overweight -- that all really happened.
"I was at a hotel, and I was overweight. I was lying on a chaise, and I thought it was all private.
"This guy was in the pool and he had a gym bag and a two-year-old son with him.
"He picks his son out of the water, sits him on the edge of the pool, opens his gym bag, takes out his camera and fires across the pool at me. It was on the front page of the National Enquirer the next day.
"The headline was 'Beached Male'. That stung a little."
Matt's Friends co-stars, which includes Lisa Kudrow, Jennifer Aniston, Courteney Cox, Matthew Perry and David Schwimmer, love 'Epiosdes' because it pokes fun at him.
He added: "The only one they were making fun of was me so everyone else came out smelling of roses -- they all thought it was really funny."

Rita Ora says you should "satisfy" your partner.
The 23-year-old singer, who is dating Calvin Harris, has hinted she enjoys kinky role play in the bedroom and likes to please.
When asked about playing characters in the boudoir, she told The Daily Star newspaper: "When you have a partner you have got to do what they want. So satisfy that partner and they should do the same to you.
"Everybody has an imagination and can be a bit creative.
"But you keep it to one person... you don't want to be too generous."
The blonde beauty is set to hit the big screen in the adaptation of E. L. James' novel 'Fifty Shades of Grey' and admires her co-star Jamie Dornan who had wife Amelia Warner and his daughter - who was born in November 2013 - on set.
She added: "Jamie is gorgeous. And he had his wife and his kid on the set a lot.
"But that makes him hotter... an unavailable guy for me is a bit like - wohoo!"

Kelly Rowland has gotten married.
The former Destiny's Child singer and her manager Tim Witherspoon tied the knot in a secret ceremony in Costa Rica last Friday (09.05.14), it has been claimed.
A source told Us Weekly: "It was a quick, simple ceremony - only around 30 people."
Among the guests were Kelly's former bandmate Beyonce and her sister Solange.
Although the nuptials haven't been confirmed, Beyonce had posted a photograph to her Instagram account on the big day wearing what appeared to be a bridesmaids dressed but was captioned only: "Good morning."
Speaking last December, 33-year-old Kelly admitted she and Tim had been engaged for some time.
She said: "He put a ring on it. It's been a while. We've kept it very, very low - for years, to be completely honest."
Kelly also revealed her boyfriend of four years proposed on Skype while she was in Bulgaria.
She said: ''He put a ring on it! He asked me first on Skype and I was like, 'We're so far away from each other.' But it was so late, I remember we were both just kinda like, honestly, just staring at each other ... and he asked me, and it was just that simple to say yes.''
The 'Kisses Down Low' singer was previously engaged to footballer Roy Williams, but they split in January 2005 without making it down the aisle.

Hugh Jackman loves that there are "not a lot of surprises" about Jennifer Lawrence.
The Australian actor really enjoyed working with the 23-year-old beauty on 'X-Men: Days of Future Past' and found her down-to-earth attitude refreshing.
Asked what he likes best about, her said: "There are not a lot of surprises.
"What you see is what you get, and I've met her and worked with her...The way you imagine her to be is how she is.
"She's not only one of the most talented actors I've met, she's one of the most authentic. Very down to earth, no ego. She has a lot of fun doing what she does."
And the 45-year-old star had a great day off camera when the actress and her boyfriend and their co-star Nicholas Hoult joined him and his children Oscar, 13, and Ava, eight, on a day out to a theme park.
Hugh - who is married to Deborra-Lee Furness - told E! News: "We were just on roller coasters -- no security, no this, no backup. Just getting around.
"And she just manages to handle this incredible fame and power that she has with real ease. On top of that, she's a brilliant actor.
"I would happily hang out with those guys because they're really terrific. I had a great time with them."

McBusted's Dougie Poynter likes wearing women's clothes.
The 26-year-old bassist recently signed to Storm Model Management and has been inspired to wear ladies' garments having been mixing with models and admits he's even thought about trying on women's underwear.
He told the Daily Mirror newspaper: "There is such diversity in girls dress sense, even from their underwear.
"There is such a huge range ... I might even even start wearing them.
"I am actually wearing women's jeans tonight and I love women's shirts."
The 'All About You' hitmaker signed to Storm earlier this year after attending a party with rumoured then-girlfriend Ellie Goulding, joining the likes of supermodel Cara Delevingne and Jourdan Dunn, who are also represented by the esteemed modelling company.
A representative said at the time: "We are really excited to be working with Dougie Poynter through our Storm Artists division.
"The talent division at Storm also works with A-list names from the world of film and music to create exciting opportunities within the fashion industry. Dougie will join a prestigious client roster which includes other bands, DJs and musicians."

Solange Knowles got into another argument before her elevator fight with Jay Z.
The 'Losing You' singer - who appeared to attack her brother-in-law in a lift in New York's Standard Hotel while attending an afterparty for the Met Gala last Monday (05.05.14) - was reportedly seen yelling at fashion designer Rachel Roy earlier in the evening.
The mother-of-one's famous sibling Beyonce, 32, "got in the middle of it" to cool the situation, an onlooker tells Us Magazine.
However, another source claims Solange yelled at numerous people, including Rachel, who was once married to Jay Z's former friend and business partner Damon Dash.
Surveillance footage emerged yesterday (12.05.14) of Beyonce's enraged younger sister hurtling towards Jay - real name Shawn Carter - in the lift, landing a series of punches and kicks while the 'Drunk in Love' singer stood back out of the fray.
It's not known what caused the heated altercation between Solange, 27, and the 44-year-old rapper, but all parties have remained tight-lipped about the incident.
A source said: "Beyonce tried to stay out of it. She does not approve of violence. They are trying to put the situation past them now."
Prior to the drama, Beyonce, 32, and her younger sister were seen dancing up a storm on the dancefloor with supermodel Naomi Campbell, while Jay - who has two-year-old daughter Blue Ivy with his spouse - "hung back at one of the fireplace areas".
Despite the controversial video, Beyonce and her husband were spotted last night at a basketball game between the Brooklyn Nets and the Miami Heat at the Barclays Centre in New York and appeared relaxed and carefree.

Kaiser Chiefs' Ricky Wilson had an accident on the bumper cars while filming their next single.
The 36-year-old singer was spotted wearing an eyepatch at last night's (12.05.14) Radio Academy Awards and insists things got "out of hand" at the fairground when they were working on the video for their music.
He said: "We were filming a video for our next single and I had a minor accident.
"I was on a bumper car because we were filming in a fairground and things got out of hand.
"You'll understand why when you see the end result."
Ricky insists the incident could have happened anywhere since they weren't performing a dangerous stunt.
He added: "It wasn't even a stunt, it could have happened in the kitchen."
Meanwhile, the Kaiser Chiefs - also made up of Simon Rix, Vijay Mistry, Nick 'Peanut' Baines and Andrew White - recently admitted they want their track 'Coming Home' to be England's unofficial world cup anthem even though The Football Association have selected Gary Barlow's 'Greatest Day' - featuring former Spice Girl Mel C, Pixie Lott, Katy B and Gary Lineker - as the official track ahead of the competition in Brazil this summer.
Bassist Simon said: "Hopefully, 'Coming Home' will be played when England are carrying the World Cup on the plane back home."
Ricky joked: "We could always do a special edition - 'Coming Home Early!'"

Diana Vickers isn't surprised 'The X Factor' musical 'I Can't Sing' has been axed.
The former 'X Factor' contestant, who shot to fame on the talent show in 2008, has now become a West End actress herself and admits she didn't see 'I Can't Sing' at the London Palladium and isn't shocked it closed on Saturday (10.05.14) after just two months.
She told BANG Showbiz: "I've not seen it but it's a shame it's closed. Once you've done that and been in it, I don't think I'd really want to go back [and watch the musical].
"New shows which go into theatres are not doing their time. People don't really have a lot of money. I don't think viewers of 'The X Factor' could afford to pay for a ticket, it can be quite expensive."
'I Can't Sing' received positive reviews for its satirical take on 'The X Factor' and its stars, including Simon - played by Nigel Harman - Cheryl Cole, Louis Walsh and host Dermot O'Leary.
Diana, 22, made her professional acting debut in the West End production of Jim Cartwright's 'The Rise and Fall of Little Voice' in 2009 and recently landed a part in ' The Duck House', starring Ben Miller, at London's Vaudeville Theatre, which was nominated for a Laurence Olivier Award for Best New Comedy this year.
The singer - who is promoting National Smile Month, which takes place between May 19 and June 19 - said: "Duck House was a new play and no-one even knew the script and we managed to do our run and break even, that was really good.
"It's never nice to hear when a theatre show closes and doesn't manage to stand the test of time."
Diana Vickers is the face of Wrigley's Extra White Bubblemint campaign for National Smile Month 2014, encouraging people to chew sugarfree gum for a clean and healthy smile.
Check out the Wrigley Extra UK Facebook page to find out more: www.facebook.com/extraofficialUK.