Pasta Salad

I've never been a huge pasta salad maker or eater...but my friend in my ward made this for us and it is really good. So of course I had to get the recipe!
1 lb. box of spiral pasta (rotini)

*Boil as directed, then add dressing while pasta is still hot.

Dressing:

2 cups mayo

1 pkg. Good Seasons Italian dressing mix

*Refrigerate for a few hours then add:

1/2 pound cooked, crumbled bacon

2 cups chopped celery

1 cup mozarella cheese, cubed or shredded

1 cup chopped tomatoes

1 cup slivered almonds