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We can't believe nobody found out until now!

Portia de Rossi secretly checked into rehab in early May, In Touch reports.

The Aussie actress reportedly spent 30 days at the Passages Malibu facility, and her doting wife Ellen Degeneres would visit every weekend to lend her support.

It's unclear what the Arrested Development star was being treated for, but she previously sought treatment for an eating disorder in 2000.

We're happy she's taking the steps to be healthy!