(Cover) - EN Showbiz - Scarlett Johansson and Sean Penn have reportedly moved in together.

Scarlett who is in the process of divorcing Ryan Reynolds after the pair split last year - has been seen with Sean several times in the past few months and they are believed to have enjoyed a romantic holiday to Mexico in January. Even though the stars have insisted they are just friends, it has been claimed they have decided to set up home together at Seans $3.8 million Malibu mansion.

Both parties are smitten. Sean asked Scarlett to move into his mansion in Malibu and shes already moved out of her own Hollywood pad, and started unpacking her things, a source said.

The couple are said to have celebrated Scarletts move with a drinks party for their closest friends, which was held last weekend.

Scarlett has been spending a lot of time with 50-year-old Seans children and is also forming a bond with Seans mother, Eileen, who lives just a mile away.

It was recently reported Scarlett and Seans relationship became serious after their trip to Mexico.

Things changed after they went to Mexico, a source said. They really connected and stayed up all night talking. Sean is a pretty fascinating guy and Scarlett was just blown away by him. Things have progressed really quickly since then.

Scarlett, 26, and Sean also attended Reese Witherspoons wedding to agent Jim Toth last month. This decision has sparked further speculation that the relationship is heating up. (C) Cover Media