According to the Magazine US Weekly Justin and jasmin went on a romantic walk along the streets of Venice last September 9th, 2010.This was the same jour that the "kiss" photo was taken.
So it is possible that Justin and jasmin (or Jasber) are going out, ou having been going out for some time, ou just started going out. Who knows?
We will have to wait to catch them s’embrasser again, ou wait for them to say something about their relationship on Twitter.