They were first spotted getting very cosy in October last year.
And Sam Smith's boyfriend Brandon Flynn has shared a gushing birthday message to the singer via Instagram as he rang in his 26th year on Saturday.
The 13 Reasons Why actor, 24, posted a sunny snap of the Stay With Me hit-maker as he called his beau an 'angel' while celebrating separately with Sam currently on the European leg of his tour.
'He's an angel!' Sam Smith's boyfriend Brandon Flynn shared a loving tribute to his singer beau as he rang in his 26th birthday on Saturday
The loving snap showed Sam in a pair of black sunglasses and a blue linen shirt as Brandon gushed over his boyfriend's accomplishments.
The actor captioned the snap: 'He’s in a different time zone and it’s hit his birthday! Just finishing his European leg of his tour, at 26 he’s accomplished so much.'
'He’s an angel! He makes me so f***ing happy and I hope everyone goes and shares all the birthday love, it ain’t easy getting old but he’s doing it with grace.
Concluding the post, Brandon wrote: 'Thank you for everything, Samuel! Happy 26, here’s to another amazing year of life!'
Loved up: The actor and singer were first pictured kissing each other in New York City, late last year in October
The actor and singer were first pictured kissing each other in New York City, late last year in October.
Fans first caught wind of their romance when they were seen liking each other's social media posts.
Sam posted an 'x' in comments underneath a social media posting by Brandon last year, in which he voiced support for the LGBTQ community.
The hitmaker was previously linked to model Jay Camilleri in 2016 after a short-lived relationship with model Jonathan Zeizel in 2014.
The sweet birthday post comes after Sam's admission he was utterly mortified their erotic antics were caught on camera.
The steamy lip-lock was caught on camera in February, and Sam told BBC Radio 1 Breakfast Show with Nick Grimshaw: 'It was a joke, as a joke we were attacking each other.
'We were just waiting outside the shop while my sister got cigarettes. I was just joking. I was literally licking his eyeballs. It’s horrendous. I’m going to have to do something crazy to top it.'
With reference to the Disney film The Little Mermaid, he said: 'Brandon looks like Ursula sucking the voice out of Ariel. It’s so embarrassing.’
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