For months they have denied any romantic involvement.
But Sean Penn, 50, and Scarlett Johansson, 26, have been spotted holding hands, a sure sign that their relationship is more than platonic.
The couple were attending the White House Correspondents' Dinner after-party in Washington, DC, and were snapped leaving in the early hours, Scarlett wearing Sean's jacket.
This is the second time the pair have been spotted in an intimate pose.
In early March they were pictured enjoying a cosy lunch together at a restaurant in Los Angeles.
Scarlett had removed her shoes and had her feet placed on Sean's lap.
And later that month, it was reported that they had gone on a romantic trip to Mexico.
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