super radiant peach
The final transformation in Princess Peach: Showtime!, given to Peach by the power of nearby Theets after Grape destroys the Sparkle Theater.
She retains the large crystallized crown, sun-like brooch, and the white & blue colors of the Radiant Peach dress. But instead this dress is similar to Rosalina's, losing the puffy short sleeves for long and wide sleeves. And while this dress retains the expelling of a sparkle-like pattern from underneath, the dress itself is also covered with prints of this same pattern.
Known as Super Prism Peach in Japanese.