radiant peach
The penultimate transformation in Princess Peach: Showtime!, granted to Peach through the power of the Sparkla Spirits. It allows her to face off against the final boss, Grape.
She's given a large crystallized crown, her brooch is surrounded by a sun-like pattern, and her dress is turned white with the bottom and inner parts being blue. The dress also expels a sparkle-like pattern from underneath.
Known as Prism Peach in Japanese.