The Royal Heart by Greg McGoon
Plot Summary: Once upon a time in a faraway land, an heir to the throne is born. The King has a son to follow in his footsteps. But life might not be quite as it appears for this Royal Family. All will be revealed on their child's 16th birthday. Family love triumphs over doubt and together they grow stronger. Join this Royal Family on the path to discovery, acceptance and celebration.
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A prince transitions to being a princess after feeling uneasy in her role. This is a fantasy coming out story. However, the transition might be a little abrupt for kids as her fairy godmother merely poofs her boy-clothes into a ball gown. Like most coming out stories, it upholds a gender binary.