excruciatingly
ref; to extreme pain, severe discomfort (-applied to human physical attributes, it refers to something on the edge of reality, as we know it)
Example:
she was excruciatingly pretty
he was excruciatingly attractive
her butt was excruciatingly perky
she was excruciatingly pretty
he was excruciatingly attractive
her butt was excruciatingly perky