Justin Bieber Serenades Hailey Baldwin Outside Buckingham Palace With an Acoustic Version of 'Cold Water': Watch

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Justin Bieber and Hailey Baldwin are spotted at Buckingham Palace in London on Sept. 18, 2018.

Justin Bieber knows how to make the ladies--especially Hailey Baldwin--swoon.

The singer was seen singing "Cold Water," his hit collaboration with Major Lazer and MØ, outside Buckingham Palace in London on Tuesday (Sept. 18). He serenaded a group of fans, including his fiancee Hailey Baldwin.

Bieber and Baldwin were in London for the model's Adidas fashion show. The pair reportedly tied the knot on September 13 in a New York courthouse, though Baldwin denied the rumor in a since-deleted tweet.

See some of the crooner's "Cold Water" acoustic below.