The 20-year-old Canadian singer met with delighted fans in the fast food eatery, after he was unable to enter the Bruxelles pub as he was under the age of 21.
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Hours later, several fans took to social media to post selfies alongside Shawn as he tucked into a late night feast, after a stellar performance at the 3Arena as part of his worldwide tour.
Smile! Shawn Mendes was spotted posing for selfies with fans in a Dublin McDonalds in the early hours of Sunday morning, after being turned away from a pub for being underage
In the video, Shawn can be seen speaking to a member of security outside the bar, who tells him that he cannot come in as he is underage.
The Stitches hitmaker could be seen making his way down the street with an entourage in toe, telling the bouncer: 'Alright, bye. I tried.'
Shawn had previously wrapped up a sensational show in Dublin where he delighted thousands of fans with a 21-song set.
Unfortunate: He could just be heard explaining that he was below the entry age of 21, and so could not enter
But it seemed that Shawn still managed to enjoy a fun-filled evening despite the setback, as he was later seen tucking into some dinner at McDonalds in the early hours.
The night was evident by various selfies posted by fans on social media, who couldn't hide their delight at meeting the teen heartthrob.
It seemed the star was at the eatery well into Sunday morning, as one snap posted by a fan had a timestamp of around 3:13am.
Shawn has been trotting the globe for weeks as part of his nationwide tour, and has since arrived in London for three nights at the O2 Arena.
The star also set tongues wagging last month when he appeared to 'like' a snap posted by ex-girlfriend Hailey Baldwin, who has since married singer Justin Bieber.
But Justin was quick to assure curious fans nothing was going on. 'Their [sic] friends relax,' Justin commented, according to a screen-grab captured by Comments By Celebs.
