Pinkie Pie along with Santos, Mathew, And Matilda, and you may not see it, but also Nichole Cat is dancing too, this was after Henry and Pinkie turned 21, and was dancing to this song
https://www.youtube.com/watch?v=vH4m9ui3SLo

this was 2 years before Henry passes away, and after he passed away 2 years later, Pinkie marries Cheese Sandwhich, she still loves Henry, and misses him from time to time.