Princess Bubblegum's diary is first seen in "Burning Low" after she barges in her room, upset about the situation of Flame Princess being unstable.


S4e16 PB's diary equations

Princess Bubblegum's diary has a tan cover with blue letters, along with a blue and gold insignia at the bottom half of the book, and plating towards the top. Inside the entries that can be seen include: FINN + LOVE + FLAME PRINCESS, a formula containing the Traditional Chinese and Japanese character for romantic love, 愛, and ∞, the symbol for infinity. Another formula contains the information "AUG," "18," and "y=2012." Andy Ristaino mentioned this (August 18, 2012) as the date that background painter Santino Lascano would be married.[1]


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