If using raw shrimp, steam shrimp in a skillet with water over medium heat until shrimp are cooked.
Place shrimp in cold water to stop cooking and chill shrimp.
If using precooked shrimp, thaw in cold water if frozen, or rinse if refrigerated.
Blot shrimp dry with a paper towel.
Slice shrimp in half, or smaller.
Mix mayo with celery, onion, celery seed, old bay seasoning
Add in the lemon juice.
Mix the shrimp and pasta into the sauce.
Serve chilled.