Justin Bieber and Hayley Baldwin stroll through London on Monday. Bieber nods a quick "hello" to the filmer, Lizzy.

"I was walking home from work and spotted several paparazzi in the road," Lizzy said.

"After walking slightly further, I spotted Justin and Hayley walking towards Holborn!"

They had been heading there from Chancery Lane. "I walked past them and took a quick video while Justin was singing to himself. I waved at him and he gave me a quick hello! Hayley is here for London Fashion Week."

Taken by Chancery Lane station at around 5pm. I was walking home from work and spotted several paparazzi in the road. After walking slightly further, I spotted Justin and Hayley walking towards Holborn! I walked past them and took a quick video while Justin was singing to himself. I waved at him and he gave me a quick hello! Hayley is here for London Fashion Week.