Justin Bieber as a good luck charm makes sense to me and Clevvertv is saying that a kiss on the cheek with Bieber may be a growing trend. The most recent is Christina Milian and we are shown the picture to prove it.
It seems that the kiss photo, which is very innocent so no fans get crazy, was all the idea of Christina while they were both working on CSI. Justin was very accommodating of the photo and this could be a growing trend. It is kind of like rubbing the top of someones head, smacking a logo on the way out to a football game, a four leaf clover, or kissing the Blarney Stone I guess. If Christina Milian all of a sudden drops a top of the charts 4th album others may decide to get on this as well.
I can tell you this though, anyone that has their picture taken with Justin Bieber is going to be in the public eye regardless, so I guess that is good luck afterall.
Source: Clevvertv