The rest of the supporting cast is more than welcome to hog the funniest and most scrumptiously tart lines, including Stephen Merchant as Danny, Josh's obnoxious best man and friend who suffers from a
bad case of verbal diarrhea, causing one of the most cringe - inducing reception toasts in recent memory and Minnie
Driver as Naomi, Nat's blunt, bitter sister who has a love -
hate relationship with her punching - bag doctor husband (Jason Flemyng).