Prepare pasta according to directions on package.
Meanwhile, heat oil in a large nonstick skillet over medium-high heat. Add leek and bell pepper strips; saute 4 minutes. Stir in broth, zest, and juice; cook 3 minutes.
Add the cream cheese. Reduce heat to medium-low; cook until cream cheese melts (about 2 minutes), stirring constantly. Add cooked pasta, salt and pepper, and cook for 2 minutes or until thoroughly heated.
Remove from heat, stir in cheese and remaining ingredients. Serve immediately.