Scarlett Johansson believed to have moved in with Sean Penn

Scarlett Johansson has reportedly moved in with Sean Penn.

The ‘He’s Just Not That Into You’ actress – who was previously in a relationship with Ryan Reynolds – is believed to have moved into ‘Milk’ actor Sean’s $3.8 million Malibu home, which surely beats staying in a west Hollywood hotel.

A source told Us Weekly magazine that Scarlett “has essentially moved in over the last few weeks”, adding the pair “stay at home whenever they can”.

Who wouldn’t stay at home as much as possible if you had Scarlett for company?

But the happy couple don’t appear to be indoors all the time, as photos of them jogging have appeared in some publications – and the pair have even had to quash speculation that ‘The Nanny Diaries’ actress is pregnant.

At least if she does get pregnant soon, Sean’s house should be a better environment to bring up a little one in than a hotel.

Ashton Kutcher, Sean Penn, Justin Timberlake: "Real men don't buy girls"

The campaign was launched by the charity foundation of Ashton Kutcher and wife Demi Moore, who enlisted pals including Justin Timberlke, Bradley Cooper, Sean Penn and Eva Longoria for the cause of raising awareness about sex slavery.

The public service announcements display the actors in a number of bizarre, macho tasks such as shaving with a chain saw and toasting a cheese sandwich with an iron, before telling viewers that "real men don't buy girls," and urging them to take a stand against child sex slavery.

Scarlett Johansson & Sean Penn Are Dating

Scarlett Johansson and Sean Penn made their "official" debut together over the weekend at Reese Witherspoon & Jim Toth's wedding.

UsMagazine.com reports that the couple, who have been keeping their relationship on the down low, left the wedding and went to Jimmy's Bar at the nearby Ojai Inn and Spa for a nightcap.

Scarlett was weary of the attention when the couple entered the bar, reports an eyewitness, but later loosened up after actor Tom Hooper and a friend joined them. She eventually sat in Penn's lap after a few gin and tonics and Hooper and his date left - after which the couple reportedly made out for 15 minutes in view of the other patrons.

The couple sparked rumors earlier this year at a party in Los Angeles for the film Black Swan, and they also attended Madonna's post-Oscars party - but kept their distance from each other to avoid any attention.

But earlier this month Scarlett, 26, and Sean, 50, were spotted getting close having lunch together at Cuban restaurant Versailles, as reported by TMZ.com. They followed that with a short getaway to Cabo San Lucas, where a source told Us, "They were acting like teenagers in love and were all over each other. Kissing a lot and chain smoking."

Scarlett, one of Jim Toth's clients, recently split with husband Ryan Reynolds; Sean finalized his divorce with Robin Wright in August.