The “Home Alone” star recounts being mistaken for her former onscreen son’s actual mother.

Catherine O’Harais not actuallyMacaulay Culkin’s mother, ya filthy animals.

Out of the blue, he asked me.

Catherine O’Hara and Macaulay Culkin

Catherine O’Hara with Macaulay Culkin at his Hollywood Walk of Fame ceremony.Amy Sussman/Getty

And my first reaction was, Aww,'" she says.

“I told my husband, Aww.

It just was the sweetest idea.

Home Alone

Catherine O’Hara and Macaulay Culkin in ‘Home Alone’.20th Century Fox/Kobal/Shutterstock

He seemed so happy.

Hes got a lovely fiancee, two sweet kids.

Amy Sussman/Getty

O’Hara recalls the mix-up occurring during the celebration’s photo-op.

And then we all pose.

We pose, pose, pose,” she says.

His mother was not able to make it at that time.

But were all posing, posing, posing.

‘Now Natasha, now so-and-so.

OK, now just you and the mother.

And I walk away and he said, Just with the mother.

No, with the mother.

Im not you know Im not his real mother.

Culkin didn’t skip a beat with his response.

“Well then, Im honored to be here.

“How does anyone survive that?

O’Hara’s fullSunday TODAYinterview airs Feb. 11 on NBC.

Want more movie news?