Christina Aguilera on the Set of "Burlesque"

It’s been a long time since Christina Aguilera left Pittsburgh for the glitz and the glam of Los Angeles. Yet, she’s probably conjuring up her days in the Steel City to play Ali, a small-town girl who arrives in Hollywood to pursue her dreams, in the musical film Burlesque, currently filming in L.A.

The big-voiced songstress, who recently wrapped her fourth studio album Bionic, co-stars alongside Cher, Kristen Bell and Stanley Tucci in the flick. She was spotted on set this week letting out some mighty yawns between takes. But before you judge, we have to give it up to Xtina: It must be tough managing a successful music career with a film debut while having an active toddler at home.

Still, Aguilera is delivering. “Her game is good,” said Cher, who plays Tess, the proprietor of the ailing burlesque lounge where Ali gets a job as a cocktail waitress. And if the 63-year-old icon says it, we believe it.

Here’s a behind-the-scenes peek, thanks to Entertainment Tonight: