Hilary Duff's Son Luca Sings the 'Ghostbusters' Theme Song!

Hilary Duff heads to her car after picking up some takeout food from Le Pain Quotidien on Tuesday (July 26) in Los Angeles.

The day before, the 28-year-old actress rocked a straw hat and took her four-year-old son Luca to a park in Studio City for a play date with friends.

PHOTOS: Check out the latest pics of Hilary Duff

On Wednesday, Hilary shared an adorable video on her Instagram of Luca belting out the Ghostsbusters theme song!

“Guys! I don’t love to put my kid on blast but this is just too good!” she captioned the video. “#Ivewatchedit200times #thiswillbeshownathiswedding #ghostbusters #whoyagunnacall #lucanailedit ❤️❤️❤️❤️❤️.”

Watch it below!

35+ pictures inside of Hilary Duff at the park…