Michelle Williams has moved in with boyfriend Jason Segel.

The 32-year-old 'My Week With Marilyn' star and the 'How I Met Your Mother' actor have reportedly taken their relationship to the next level and recently began living together with her daughter Matilda in a sprawling New York loft just six months after going public with their romance last April.

A neighbour told the Daily Mail: ''Michelle, Jason and Matilda seem very happy here, the building is beautiful.

''They've been here a few months now and they look right at home.''

The couple are living in a stylish property in a converted warehouse with large gates to protect their privacy, not far from their previous home.

Up until recently the actress was still living in the $4.2 million Brooklyn apartment she shared with the late actor Heath Ledger, who is the father of her six-year-old daughter Matilda and died of an accidental drugs overdose in 2008.

Matilda is reportedly a huge fan of Jason, who has been friends with Michelle for a long time after being introduced by their mutual friend actress Busy Philips.

A source close to Jason previously said: ''I never thought Jason would ever date someone with a kid. But he's taking everything in stride. He's ready to be a grown-up.

''Matilda loves Jason, he knows how to entertain children. You can't be that obsessed with puppets and not learn a few things!''

Meanwhile, Michelle is also said to be smitten by her latest love and friends say she think he could be the one for her.

A pal said: ''She's fallen for him hard. She's really giving this a shot.''