@shawna27 EDIT: LoL, misread the title as lats...
5 sets 3-5 reps seated* military press with progressive overload (increase weight as soon as you can do 5-6 reps on first set), 3 sets arnold press for 6-8 reps (increase weight as soon as you can hit 8 on first set), and 3 sets reverse flies 6-8 reps. Do all 3 exercises in a workout twice a week.
*OHP isn't bad-ish, but I find that if you're really trying to target a muscle then taking out all the core stabilization that's required for OHP helps increase the workload of the target muscle. I also find that heavy OHP as you age is really, really bad for the back - it doesn't like compressive forces.
And on a plug for my edit: wide lats and deltoids will make you look bigger moreso than traps. Disproportionately big traps make you look like you have no neck.