He was 1/4 of one of the biggest boybands around, so it's no surprise Irish hunk Niall Horan has been linked with stunning girls like Selena Gomez, Ellie Goulding and Olympia Valance in the past.
But now, fans of the former One Direction heartthrob have gone into meltdown after Niall was spotted getting rather cosy with American singer and actress Hailee Steinfeld.
The pair were spotted attending a Backstreet Boys gig at Planet Hollywood in Las Vegas over the weekend, and it didn't take long for fans to think something could be going on between the pair.
According to reports, Niall and** Pitch Perfect** star Hailee were spotted chatting and 'getting close' in the VIP area as they danced to hits from the Backstreet Boys.
Fans who were also at the gig were quick to share photos and videos of Niall and Hailee to social media.
One fan shared a video of Niall and Hailee as they danced to 'I Want It That Way'.
Another user wrote, 'NIALL HORAN (and Hailee Steinfeld) are sitting behind me at a @backstreetboys concert. This is not a drill. I am not okay.' [sic]
Now of course the pair have been spotted together before, which has only gone and fueled rumours of a romance even further, but it seems some fans aren't that keen on the potential romance...
Back in December, Niall shared a photo of the pair to wish Hailee a happy birthday. He wrote, 'Happy birthday to the loveliest person on the planet and one of my best friends @haileesteinfeld . Have no idea what the hell is going on in this photo. Love ya hails'. [sic]
See which celebrity couples we NEVER saw coming:
Celebrity couples we never saw coming slider with cover pic
1 of 17Swipe through to see all the surprising celebrity couples we never saw coming...
2 of 17Gabby Allen and Myles Stephenson
After her split from fellow Love Island star Marcel Somervillle, CBB star Gabby Allen announced she is now dating X Factor winner Myles Stephenson.
3 of 17Prince Harry and Meghan Markle
Prince Harry and Suits actress Meghan Markle began dating in October 2016 and married in May 2018. Their first child is due in Spring 2019.
4 of 17Channing Tatum and Jessie J
After splitting from his wife in early 2018, EVERYBODY was left in shock when reports suggested Channing Tatum is dating pop star Jessie J.
5 of 17Selena Gomez and The Weeknd
Nobody saw a romance between singers Selena Gomez and The Weeknd coming! But they went strong until October 2017 when the pair reportedly split up.
6 of 17Cheryl and Liam Payne
Cheryl and One Direction singer Liam Payne shocked the world when they announced they were dating back in February 2016. Despite a ten year age gap, the couple welcomed their first child, Bear Grey Payne, back in March 2017. However, in July 2018, Cheryl and Liam released a joint statement revealing they'd split.
7 of 17Katy Perry and Russell Brand
Katy Perry and Russell Brand married in 2010, much to the surprise of fans. Their marriage was short-lived, leading to a divorce in 2012.
8 of 17Taylor Swift and Tom Hiddleston
Taylor Swift and Tom Hiddleston were 2016's most talked about romance! Unfortunately, the couple went their separate ways a year later.
9 of 17Rob Kardashian and Blac Chyna
Rob Kardashian started dating Blac Chyna in 2016, despite her previously dating Rob's sister's ex-boyfriend Tyga. They welcomed a baby girl together called Dream and later ended on very bad terms!
10 of 17Vogue Williams and Spencer Matthews
Fans didn't expect Vogue Williams and Spencer Matthews to become a couple! The pair met when they were filming for Channel 4 show The Jump in 2017, got married in June 2018, and welcomed son Theodore in September 2018.
11 of 17Sacha Baron Cohen and Isla Fisher
Sacha Baron Cohen and Isla Fisher married in 2010 after a six year engagement. Nobody saw this marriage coming with the unusual movie roles Sacha plays!
12 of 17Stephanie Pratt and Jonny Mitchell
Love Island star Jonny Mitchell and Made In Chelsea's Stephanie Pratt left fans in shock when they confirmed their romance with this picture in September 2017. Sadly, the couple have split in December 2017.
13 of 17Benji Madden and Cameron Diaz
Actress Cameron Diaz married Benji Madden just two months after she met him, despite many not seeing their romance coming.
14 of 17Nicole Richie and Joel madden
After starring in TV show The Simple Life with her best friend Paris Hilton, Nicole Richie turned a lot of heads when she married Good Charlotte singer Joel Madden in 2010! They share children Harlow and Sparrow.
15 of 17Chris Martin and Jennifer Lawrence
After his split from Gwyneth Paltrow, Coldplay singer Chris Martin was spotted getting cosy with The Hunger Games actress Jennifer Lawrence. Despite not actually confirming a romance, the pair reportedly called things off in 2016.
16 of 17Sam and Aaron Taylor-Johnson
Fans of actor Aaron Johnson were left in shock when he married Fifty Shades Of Grey director Sam Taylor. Despite Sam being 24 years older than Aaron, the pair combined their surnames when they got married in 2012. They now have two daughters together, Wylda and Romy.
17 of 17Mary-Kate Olsen and Olivier Sarkozy
Olsen twin Mary-Kate married French banker Olivier Sarkozy in 2015, despite a 17-year age gap between the pair.
Whether he's in a relationship or not, Niall continues to delight his fans by dropping more AMAZING solo music.
The singer recently released his brand new single 'On The Loose', which is the fourth single taken from his debut solo album 'Flicker'.
Niall has previously dropped the tracks 'Slow Hands', 'This Town' and his last single 'Too Much To Ask'.
Last year, Niall delighted his fan base when he announced a UK and Ireland tour for 2018.
Taking place in March, Niall will begin the tour in his native Ireland, before travelling to Manchester, Glasgow, London, Cardiff, Bournemouth and Brighton across the month, with Julia Michaels joining him as a special guest.
See the full list of dates below:
MARCH 2018:
Dublin, Ireland, 3 Arena - Mon 12th March
Belfast, Ireland, The SSE Arena - Tue 13th March
Manchester O2 Apollo, UK - Thu 15th March
Glasgow SEC Armadillo, UK - Sun 18th March
London O2 Academy Brixton, UK - Thur 22nd March
Cardiff Motorpoint Arena, UK - Sat 24th March
Bournemouth BIC, UK - Mon 26th March
Brighton Centre UK - Tue 27th March
You can hear Niall's amazing solo music on **heat **playlist.