They’re only three months into their unexpected romance, and Scarlett Johansson and her gray haired boo Sean Penn are already playing house! According to Us Weekly, the Hollywood couple recently took things to the next level by having Scarlett move in to Penn’s $3.8 million Malibu home.

A source tells the mag that the recently divorced Johansson, 26, “has essentially moved in over the last few weeks.” And now that the actress and Penn, 50, share the same roof after months of furtive sightings at hotspots in Hollywood, Mexico and beyond, “they just stay home” whenever they can.

Seriously, how did these two end up dating?  Forreal, we’d really like to know!