The 24-year-old pop star drew a crowd and melted hearts when he whipped out his guitar and gave a spontaneous serenade to his future wife - outside Buckingham Palace, no less.
The couple traveled to London earlier this week for Baldwin's job, and it looks like they decided to make a vacation out of it afterward. People explained that Baldwin took part in the Adidas Originals Falcon and JD fashion show on Monday, and Bieber was by her side for support.
The uber-famous Justin Bieber was videotaped on the streets of London performing.
While in London, the superstar chose to take a break in front of Buckingham Palace and entertain a crowd of fans, including his fiancee, Haily Baldwin, with an impromptu guitar show.
Justin Bieber and Hailey Baldwin are seen at the London Eye.
The couple were in the British capital, where Baldwin, 21, had a modelling assignment in an Adidas fashion show.
The soon-to-be-married couple was spotted on a date Tuesday.
Not long after it made noise online, several sources have quickly debunked the said secret marriage rumors.
TMZ reported at the time that Hailey and JB were spotted inside the Marriage Bureau looking incredibly emotional and speaking with a court official, leading many people to speculate that they had tied the knot.
However, later on, Hailey took to her Twitter to tell her fans she didn't actually get married, despite Alec Baldwin telling reports that they did.