Scarlett Johansson and Sean Penn
Brandon Todd/Splash News Online
05/01/2011 at 12:00 PM EDT
After a series of romantic-looking sightings
, Sean Penn and Scarlett Johansson
all but confirmed their coupledom with the ultimate public display of affection for super-private stars.
They were spotted in the incriminating position Saturday night, outside a White House Correspondents' Dinner after-party in Washington, D.C.
Johansson – wearing an Elie Saab cocktail dress and newly auburn hair – started the evening off with her brother, Hunter Johansson, in attendance of the annual event before joining up with Penn at the Vanity Fair/Bloomberg bash. They reportedly left together around 2:30 a.m.
In addition to their cozy outings close to home, Johansson and Penn have also been seen together in Mexico
The actress's husband of two years, Ryan Reynolds
, filed for divorce