If Kidman + Urban were the royalty of glitz, Luke + Nicole are the royalty of roots. Jelly Roll & Bunnie XOIf Nashville wants to shake up the definition of “power couple,” this is the pair. Case for the crown: They’re raw, honest and impossible not to root for. Case for the crown: If Keith & Nicole were Nashville’s Oscars couple, Chris & Morgane are its Grammys couple. If we’re being safe, Luke & Nicole Combs look like the natural successors: beloved, family-focused and chart-topping.