I think the only thing I would add would be that Grace belatedly realizes that - oh noes - she neglected her flower girl duties, and flinging the entire contents of her basket at the newlyweds.

There are many wedding photos of Steve and Danny with petals stuck in their hair, and a few of Steve taking pity on Danny and trying to brush the petals off Danny's head (and Danny shooting murderous looks at his husband, because "You'd better not muss the 'do, Steven.")