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No, it's not Jessica Simpson.
Sources say that the former boy-bander and the MTV veejay got cozy in three different cities this past week -- snuggling in Los Angeles, New York and Cincinnati. But an insider told People.com that the couple has not gotten back together -- "but they're hanging out. They'll see what happens. Maybe a reconciliation will happen, but they're not exclusive right now."
What do you think: Should Nick and Vanessa try again? Chime in below!