Rewrite the given sentence using a reference to a well-known personality.
She has strong willpower.
Her willpower is as strong as that of Oprah Winfrey.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the given sentence using a reference to a well-known personality.

### Input:
She has strong willpower.

### Output:
Her willpower is as strong as that of Oprah Winfrey.