Hilary Duff's Son Luca Loves NYC Because He Thinks Ninja Turtles Are Real!

Hilary Duff made an appearance on last night’s episode of Late Night with Seth Meyers, and revealed the adorable reason why her 5-year-old son Luca loves to stay in New York City while she films her hit show Younger.

The 29-year-old entertainer admitted to Seth that Luca thinks the Teenage Mutant Ninja Turtles are actually real and that they’re living in New York City’s sewers.

PHOTOS: Check out the latest pics of Hilary Duff

“Yes, I don’t know if you look down as much as I have recently but there’s about nine manhole covers on every city block in New York and he wants to stop at every one of them,” Hilary said. “He thinks that Leonardo and Master Splinter are down there concocting plans to save the city. He wants to look down the tiny little holes.”

Hilary switched up her outfit as she left the NBC Studios and was greeted by a flock of fans – Watch her full Late Night interview below!