Justin Bieber serenades Hailey Baldwin outside Buckingham Palace

Justin Bieber surprised onlookers by busking outside Buckingham Palace, with his fiancée Hailey Baldwin and surprised fans watching his acoustic performances on Tuesday.

The Canadian singer played a short acoustic set in London, U.K., featuring Tracy Chapman’s 1998 hit song Fast Car and Cold Water, his 2016 collaboration with Major Lazer and MØ.

The 24-year-old pop star’s fiancée, Baldwin, 21, filmed his performance as people gathered to watch.

READ MORE: Justin Bieber says religion ‘set me free from bondage and shame’

Bieber strummed his guitar and said, “That girl right there is the love of my life.”

Earlier that day, Baldwin and Bieber were sightseeing around London’s popular tourist spots. The couple was in the U.K. for London Fashion Week.

View image in full screen

View image in full screen

View image in full screen

Baldwin, a 21-year-old model, walked at the JD and Adidas Falcon fashion show.

View image in full screen

View image in full screen

READ MORE: Justin Bieber’s paparazzi run-ins: Is the Canadian singer changing his tune?

Get daily National news

Get the day's top news, political, economic, and current affairs headlines, delivered to your inbox once a day.

Sign up for daily National newsletter Sign Up

By providing your email address, you have read and agree to Global News' Terms and Conditions and Privacy Policy.

Beiber and Baldwin got engaged in July in the Bahamas.

The couple dated in 2016 before splitting, and have known each other for some time (they met as young teenagers in 2009). They have been spotted in recent months packing on the PDA in New York City parks, and each of them has been photographed crying.

WATCH BELOW: The latest on Justin Bieber and Hailey Baldwin

0:44 Justin Bieber seen crying in New York City with Hailey Baldwin

• Justin Bieber seen crying in New York City with Hailey Baldwin
• Hailey Baldwin Denies Marriage To Justin Bieber
• Madison Beer Shares Excitement For Justin Bieber, Hailey Baldwin
• Justin Bieber engaged to model Hailey Baldwin: reports
• Where will Justin Bieber get married?

Previous Video

Next Video

READ MORE: Hailey Baldwin denies she and Justin Bieber married in New York City

On Sept. 14, multiple celebrity news outlets reported that Bieber and Baldwin got married in New York City.

Bieber and Baldwin were spotted at the city’s courthouse marriage bureau, but it was unclear if they tied the knot. Publications People and E! News, among others, claimed to have verified through sources that the pair were indeed married.

Baldwin denied the reports and she posted to Twitter in a now-deleted tweet.

She wrote, “I understand where the speculation is coming from, but I’m not married yet!”

Watch Bieber’s acoustic performance in the video above.

— With files from Chris Jancelewicz