The Five Year Engagement actor Jason Segel, 32, is getting serious with My Week with Marilyn star Michelle Williams, 31.
The funny man has been seen doting over 6-year-old Matilda, Williams' daughter with the late Heath Ledger, who died in 2008.
Now, sources say Segel has reached out to Ledger's father Kim to assure him that he will be there for The Dark Knight actor's daughter.
An insider told entertainment website RadarOnline:
"Jason got on the phone and introduced himself to Kim, and then invited the Ledgers to use his home whenever they wanted to fly in from Australia to visit Michelle and Maddie."
The source added: "Kim was blown away by Jason's generosity and the two hit it off right away.
"Now Kim's given his blessing for Jason to marry Michelle and be a stepdad to Matilda."
Williams and Ledger split in 2007 after three years together. The following year, the actor passed away from an accidental prescription drug overdose.Williams has spoken out about Ledger, telling Vogue that his death 'changed how I see the world and how I interact on a daily basis. It's changed the parent I am. It's changed the friend I am'.