Derpy yelling "surprise!" for Twilight.
You always throw the best parties Pinkie
Making friends is what you do, Pinkie.
Don't you wanna enjoy the partay?
Come on Twilight, Enjoy the party. Derpy seems to be enjoying it.
Derpy is still in the background.
I just had to throw a party, ya know?
I don't think she wants to enjoy the party Pinkie, you'll get her next time.
Making friends is more important than studying...
That's hot sauce, you know that right Twi?
Follow the direction of Twilight Sparkle's horn...
Looks like Twilight can be like Derpy.
Pinkie Pie sure didn't have Twilight's reaction!
There's Derpy in the lower-right corner
The amazing Wonderbolts!!!
Leaving a smoke trail behind them
What was that,it just cut through the show.
An awesome Rainbow Dash appears!
Derpy beside Parasol and Rainbowshine.
Derpy in Rarity's dream wedding to Prince Blueblood.
You're so popular all of a sudden Twilight
This is about to get nasty.....for Spike
She teleported, I wonder how Spike
's doing. I smell burned scales
Derpy in the lower-right corner
Who are you ponies looking at?
Three Derpy clones in this scene
Even Derpy isn't happy with you two.
Most of the time you look happy Derpy
In the same spot as before
Derpy... well, being Derpy.
Derpy talking with other competitors
Derpy wearing her number backwards...
Derpy proud of herself at the Best Young Flyer competition
Derpy's eyes are normal when she spectates.
Derpy feeling the glorious raise of Rarity's wings.
Spectators watch as Rainbow Dash streaks downward to rescue the Wonderbolts and Rarity.
There are at least three Derpys (Derpies?) in this picture...
Derpy behind Rainbow´s crown.
Derpy Hooves about to see Princess Celestia's shining glory.
Derpy hooves, Young Twilight, and Derpy twin watching Princess Celestia.
For some reason, Derpy is the same age in the flashback that she is now.
An ageless Derpy Hooves amazed by young Rarity's costume designs.
Derpy Derping in line... Or not... that's for Applejack to decide.
Derpy singing after Twilight's verse during "At The Gala."
Derpy at the bottom left corner, and another partially-obscured Derpy behind a pink-maned pony at the bottom right corner.
Standing outside the VIP section.
Derpy is a VIP member to the Wonderbolts.
Derping in the Grand Galloping Gala VIP section.