After a near fatal accident, 21-year-old Lamb Mannerheim (Julianne Hough) is beginning to realise that the world is much bigger than her small, God-fearing Montana town. Armed with a big, fat insurance payout and a check-list of untried sins, there's only one place for her first taste of temptation...Las Vegas!

Now this wide-eyed, innocent girl will have to navigate the bright lights, seedy bars and dark alleys of "Sin City." And, with the help of her outrageous friends (Russell Brand and Octavia Spencer), Lamb just might survive her strange adventure and discover what it means to really live.