Notes:

Top row left to right:
Fluttershy – WTVC and WDSI news anchor Carly Flynn Morgan (She made me want to upload this image. Her hair shape reminded me of Fluttershy’s, even though she’s blond.)
Pinkie Pie – Lucille Ball (I even compared her before I learned that Pinkie Pie parodied her.)
Applejack – Terri Clark (Taylor Swift is another singer I found that wore a cowboy hat, but Terri Clark has more tomboy in her than Taylor Swift.)
Bottom row left to right:
Twilight Sparkle – Kristen Stewart (As an original MLP: FiM character while the Twilight series is quite modern, her character made me assume that she is based on typical female teens and tweens of today, while her name made me think of the actor in the Twilight films, though I haven seen the films much.)
Rainbow Dash – Nicki Minaj (Katy Perry was the only other celebrity I could find with rainbow hair, but it looked different and I wouldn’t use her because one of her songs was parodied in the show.)
Rarity – Audrey Heburn (I first started looking up purple hair celebrities and Katy Perry and Lady Gaga were the most accurate, especially Katy, but still not enough. Again, I refuse to use Katy because of what I said earlier. Then I looked up “purple hair glamor” and still no accurate celebrity look alike. My next plan was to type “Rarity looks like” in Google, and “My Fair Lady” came up. Audrey Heburn was the “Fair Lady”. That was my choice.)