Burlesque (2010)

Ali (Christina Aguilera), a small-town gal with a great voice, leaves a troubled life behind and follows her dreams to Los Angeles. She lands a job as a cocktail waitress at the Burlesque Lounge, a once-majestic theater that houses an inspired musical revue led by Tess (Cher), the proprietor. Ali vows to perform there and, with the help of a savvy stage manager and a gender-bending host, she makes the leap from bar to stage, helping restore the club's former glory.