For federal purposes, yes, you can file Joint. Not only 'can' you file Joint, since you are legally married, you have no choice but to file either Married - Filing Joint or Married - Filling Separate. ("joint" is always better financially).
For state purposes, you'd have to check each state whether you are to file Joint, Single or Married - Separate. Turbo Tax will walk you through this when its time to file.
