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Published 07:21 7 Nov 2017 GMT
Updated 11:19 7 Nov 2017 GMT
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The singer took to Instagram to document her night, and she went straight to Sophie's in The Dean Hotel.
And of course, she got a few snaps on the infamous swings, too.
Perrie and the footballer have been together for a year now, after first making their relationship official in November 2016.
Since then, the singer has become a major Arsenal fan, going to many matches to cheer her boyfriend on.
However, recently, Alex said that he's a fan of Perrie's ex, Zayn Malik's music.
Speaking to the Daily Star, he said that he likes Zayn's former band, One Direction: "I'd be lying if I said I didn't enjoy a bit of One Direction every now and then.
"They've had a few good songs that I can't resist singing along to. They've smashed the scene."
That doesn't seem to bother Perrie though, as last night in Dublin they looked more loved up than ever.Celebrity