Pearls and Pigs (movie, 2003)

When their bootlegging father ends up in jail, four twenty-something brothers need money to pay his debts to local crooks. Next, their 9-year-old half-sister is dumped on their doorstep by her prostitute mother. A karaoke set helps reveal that the little girl is quite a singer, just as a talent contest for children is coming up on national television offering more than enough money to the winner. If only the kid weren't so hopelessly shy...