Bieber may have already gotten the girl and put a ring on it, but that doesn't mean he's going to stop the romantic gestures anytime soon.
In fact, he just made a pretty huge statement to Hailey by serenading her in the public streets of London.
Whipping out his acoustic guitar and perching himself on the edge of a fountain wearing a pink hoodie, Justin began playing "Cold Water" to his fiance.
Not to mention doing a cover of Tracy Chapman's iconic tune "Fast Car", which he has previously covered in the BBC Radio 1 Live Lounge in 2016.
And if you thought it ended there then you are wrong! Justin basically held a mini-concert, continuing to sing "Good Good Father," a song by Christian artist Chris Tomlin.
You can even see Hailey recording this part of his performance.
Too freaking cute.