Jake Gyllenhaal and Reese Witherspoon went Trick or treating together...

Jake Gyllenhaal and Reese Witherspoon went trick or treating last night with the kids.

US magazine is reporting that...."They were holding hands and swinging them in the air as they walked around the neighborhood," adds a witness, who says Gyllenhaal often lifted up his gorilla mask to smooch his Rendition co-star. "Reese was laughing at everything Jake was saying." As Ava and Deacon ran up to every door for treats, "Reese and Jake waited on the sidewalk and flirted," the onlooker tells Usmagazine.com.

They even started to act like a pair of giddy kids themselves. "Jake tapped Reese on the butt and then she hit him back — they began running a circle hitting each other!" the witness says. "Then Jake picked Reese up off her feet and she screamed."

Gyllenhaal seemed to play it cool during his first public outing with Witherspoon's children.“Jake ran up to Deacon with the gorilla mask and pretended to scare him!” the onlooker says. “Deacon laughed.”

He also had a few scares for Witherspoon.

Adds the witness, "Sometimes he came up from behind and nuzzled his big hairy mask into her neck.”

How sweet is that?? AWWWWWWWWWWWWWWW!!!

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