This is how Twilight introduces Starlight, Trixie, Thorax and Discord to the Autobots goes in Darkness Rising Part 5.
[Twilight leads Optimus through Ponyville]
Optimus Prime: Twilight. Who are these friends you want to introduce us too.
Twilight Sparkle: You're about to find out.
[They arrive at her castle]
Optimus Prime: Since when did you become a ruler.
Twilight Sparkle: Many years ago.