The biggest star that you had found?

VY Canis Majoris. It's a huge star! Here's some facts about it:

-Vy Canis Majoris is located in the constellation Canis Major

-In diameter it is 3,063,500,000,000m, and it is 2,000 times bigger than the sun

-If you were to stick Vy Canis Majoris out into the middle of our solar system, it would reach the probably over the orbit of Saturn

Awesome question by the way! Maybe there are bigger stars, scientists haven't found any bigger than that, but keep your eyes open, you might actually discover something! :)