All three Animated Storyteller ponies. They are plush dolls that come with four small storybooks each. Each pony talks, reads the storybooks (the G4 ponies' stories are based upon Friendship Is Magic cartoon series), and sings songs.
Who's who, and where I brought them from: G3.5 Pinkie Pie (from Big W); Twilight Sparkle (Target exclusive); G4 Pinkie Pie (from Myer).
My Little Pony: (c) Hasbro. Created by Bonnie Zacherle. G4 characters are designed by Lauren Faust. Toys are by KID Designs.