Where were their costumes?

Jennifer Garner and Ben Affleck took their three kids trick-or-treating in Malibu last night, and if you didn't know better, you'd think they were just your average cute couple and family. The actress was in a great mood and beamed at her former hubby throughout the evening, and we guess it is possible to be close after a divorce.

The Peppermint star has been quietly dating businessman John Miller for about six months now, and according to insiders their romance is getting "serious."

"John has all the qualities Jen’s looking for in a man. He’s the ultimate Prince Charming," a source dished to In Touch.

That said, apparently the mother-of-three's loved ones want her to proceed with caution, as Miller has a lot more to gain from their relationship than she does.

"He’s an entrepreneur and being attached to one of the most famous actresses in Hollywood is a surefire shot to instant fame. He’s already being Googled and one of his companies, CaliBurger, is being buzzed about, so this is a win-win situation for John — and a risky romance for her," the source added.

We wonder if Ben ever regrets letting her go?