Miley Cyrus and Kelly Osbourne

Ever since Miley Cyrus and Kelly Osbourne co-starred in "So Undercover," the girls have been each other's greatest defenders, each taking turns standing up for the other via -- what else? -- Twitter.

( Getty Images )

Ever since Miley Cyrus and Kelly Osbourne co-starred in "So Undercover," the girls have been each other's greatest defenders, each taking turns standing up for the other via -- what else? -- Twitter.

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