No.
Enlarge person has no effect on a wild shaped druid. The transmutation (polymorph) rulestransmutation (polymorph) rules say a polymorphed creature does not benefit from size-altering spells. Wild shape is a polymorph effect due to functioning like beast shape I and other polymorph spells. Thus, a size-altering spell like enlarge person has no effect with wild shape.
You can only be affected by one polymorph spell at a time. If a new polymorph spell is cast on you (or you activate a polymorph effect, such as wild shape), you can decide whether or not to allow it to affect you, taking the place of the old spell. In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell.