Scarlett Johansson, Sean Penn move in together!

Scarlett Johansson's quick rebound relationship with Sean Penn might be more serious than we thought. The couple is reportedly living together, according to UsWeekly.

Playing house in Penn's $3.8-million Malibu pad? Not too shabby for ScarJo, who spent months living in a West Hollywood hotel after her December 2010 divorce from Ryan Reynolds.

Johansson and Penn haven't been shy about their courting. In fact, photos of the couple out for a jog with Owen Wilson, erupted into online pregnancy rumors this week. Of course Johansson's rep quashed the rumors, telling People, "Scarlett is not pregnant. She's been training for 'The Avengers' for over four months and is in the best shape of her life."

Baby bump buzz aside, news of the relationship came as a shock in February due to their 24-year age difference. Penn, who has two kids with his ex-wife Robin Wright, is 50, while Johansson is 26.