I'm sure you wish you had come up with this idea first. Some crafty DJ decided it would be a good idea to introduce Justin Bieber's hit song 'Boyfriend' to N'Sync's 2002 chart-buster song 'Girlfriend' with the resulting mashup rearing its head on Youtube earlier this month.

What happens when you put 'Boyfriend' and 'Girlfriend' together? Check the video below and share your thoughts in the comment box!