Earlier this month the How I Met Your Mother star asked his Twitter followers "a totally hypothetical question" to find out, "If I fell in love would you guys be happy?" (He's since deleted the tweet.)
His followers answered with a resounding yes. "We don't even know each other and you guys want me to be happy," he tweeted, and has also since deleted. "I'm not being sarcastic at all when I say that actually means a lot."
So was Jason talking about the My Week With Marilyn star?
Michelle's rep had "no comment" on the actress' rumored relationship, but pictures snapped by Us Weekly sure look lovey-dovey to us!
In the shots, Jason and Michelle are all smiles, holding hands in Brooklyn. In another pic, the Muppets mastermind is happily out and about with Michelle and Heath Ledger's 6-year-old daughter Matilda.
Jason costarred with Michelle's BFF Busy Phillips on the short-lived cult hit Freaks and Geeks in 1999. Michelle split from actor Heath in 2008, five months prior to his tragic death.
—Additional reporting by Maureen Heaton