Michelle Williams daughter is reportedly pushing her to marry Jason Segel.

The stars have only been dating for a few months but six-year-old Matilda has already got used to having Jason around. She enjoys spending time with him and would reportedly love to be involved in a wedding.

"You should hear Matilda talk she wants to be a flower girl, and she tells her mom she wants a little sister," a source told National Enquirer. "She knows that won't happen if Momma doesn't marry Jason so she's pushing for it."

It was recently reported that Michelle and Jason were engaged, but that's not thought to be the case. However, pals of the pair expect them to make their relationship official before long.

"Jason lives to make Michelle laugh and that's pretty hard for a gal to resist," the insider added. "Plus, he's shown he'd make a great daddy. Bet on a marriage by the end of the year."

Matilda's father is the late actor Heath Ledger, who passed away in 2008 from an accidental prescription drug overdose.