Credit: Steve Granitz/WireImage; Ryan Born/WireImage

Fashion flashback!

When Jessica Chastain hit the red carpet at the premiere of The Help in Los Angeles on Tuesday, style critics experienced a bout of deja vu.

The up-and-coming actress, 30, wore a magenta strapless Oscar de la Renta gown with vibrant turquoise earrings. And while the color combo was eye-catching, her overall look was nearly identical to the Christian Dior dress and Fred Leighton jewels Cameron Diaz, 38, donned at the Costume Institute Gala back in 2007.

And Chastain isn't the only celeb taking style inspiration from the Bad Teacher actress. Sofia Vergara, 39, went for a similar effect at The Smurfs world premiere in New York City last month, where she rocked a purple strapless Missoni dress and large turquoise earrings by Lorraine Schwartz.