How did he know?

Playmaker had a (boy) friend - two separate words :) - over the other night & we baked Christmas cookies. Nice kid. Nice time. Playmaker told me that he told her that when her dad came home from work that evening, he could tell her dad & I are in love & he tho't that was neat. He's right! but -I wonder just how he knew. It doesn't really matter - I'm just glad it shows b/c I adore my hubby & I want him to know - & I want the world to know - & given Playmaker's friend's observation - I/we must be doing somethin' right :)