The songstress shared a gushing birthday tribute to boyfriend Yungblud - born Dominic Richard Harrison - on Monday with a selection of photos of the English musician as he turned 22.
Halsey wrote: 'darling dom. everyone who has met you in this life, for any amount of time at all, will be changed forever because of it. for some, in small ways they won’t even realize.
Loved up: Halsey shared a tribute to boyfriend Yungblud on Monday as the singer turned 22
'for others, in a life changing wave. and every single one of them will be better, from having crossed your path for even a second.
She concluded her message 'you leave an irrevocable shine on every soul you come in contact with. mine is gleaming. happy birthday, I love you.'
Among the collections of snaps was one of the couple kissing passionately.
Yungblud responded with a simple 'i love you' in the comments section and posted his own photo showing him snuggled up with his girlfriend wearing Pokémon onesies.
The couple have been dating since November 2018 and made it Instagram official in December.
Halsey, 24, previously dated rapper G-Eazy on and off since 2017.
Halsey apparently slid into Yungblud's DMs with her phone number and simply a black heart emoji.
They have also collaborated on the song 11 Minutes together which was released in February.