Sean Penn & ScarJo The Great Dating MYSTERY

3/2/2011 6:00 AM PST

Sean Penn & Scarlett Johansson -- the Great Dating MYSTERY

Scarlett Johansson and Sean Penn dating rumors have been swirling -- but TMZ now has cold, hard, irrefutable proof ... that they had lunch together, and that ScarJo's foot really likes Sean's lap.

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