What's The Big Frigin' Difference?!

It's the most beautiful time of the year and Justin Bieber knows a thing or two about setting the mood during the Holiday season, but before you meet him under the mistletoe, pipe down and see if you can solve the changes in these images.

Per usual ... the Biebs was swagged out in a swirled hoodie, recently leaving a church service in Beverly Hills, and now he's hoping you can be the yin to his yang and find the minor switch-ups in the two shots.

'With you, under the mistletoe!'