It seems that Jason Segel is all fired up to take on daddy duty!

Segel, who made his romance with Michelle Williams public in March 2012, was spotted with his girlfriend’s daughter, Matilda Legder, on a day out in Brooklyn, New York. Matilda, 6, who is Williams’ daughter with her late ex-fiance Heath Ledger, looked very comfortable with The Five Year Engagement actor, and to prove it, she let the actor hold her little hand as they strolled around the street.

Back in April, a source close to Williams spilled that Matilda:

“…loves Jason. Jason knows how to entertain children. You can’t be that obsessed with puppets and not learn a few things!”

Another insider also shared:

“Jason is obsessed with Michelle and wants to be a father figure to Matilda. He’s been doing all sorts of ‘dad stuff’ with her, like drawing and playing music. They’ve been spending time together whenever possible.”

And though it seems like the 32-year-old Segel has already gotten Matilda’s blessing, his friends were in doubt about how his relationship with Williams would work. One of his confidantes revealed:

  ”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.”