Lara Flynn Boyle has been booked to appear in at least six episodes of NBC's Las Vegas this fall, a source confirms to TVGuide.com. Boyle, best known for her role on The Practice and Twin Peaks, will play the Montecito's flamboyant new owner — one who apparently doesn't frequent the $8.95 buffet much. In other TV casting news, this week's Ask Ausiello reports that Haylie Duff (that's Hilary's sis to you) is joining the cast of 7th Heaven this fall. For more, click here.