This is a brand new variety available from Johnny's Seed in 2025.  Here's from their description: 
"New! Pastel pink blend of large double blooms.
Who wouldn't want a beautiful pale pink zinnia? In 2018, Johnny's Breeding Team began work selecting for the pastel color palette. Ballerina's 4–6" flowers are a blend of soft pink and pale peach, with a mix of both dahlia- and cactus-type blooms. Produces a high percentage of double blooms. May contain a few off-types of ivory, dark pink, or yellow."
Images from Johnny's Selected Seed Website