Vidya Balan has certainly taken one and all by surprise with her sizzling hot avatar in Milan Luthria’s `The Dirty Picture`. The actress, who plays sex siren Silk Smitha has stumped veteran music composer Bappi Lahiri. The Bengali musician is smitten by Vidya’s sensuousness and is going ga-ga over her.

The music director has composed the song `Ooh La La` that is picturised on Vidya. Expressing his awe, Bappi while talking to a daily said, “Before the song, I don’t think any of her fans could have ever imagined her looking as sexy and glamorous as this.”

He is also all praise for Luthria and Ekta Kapoor for treating the story in the best possible way. “The way the film has been picturised is awesome,” said Bappi. Lahiri, who was responsible for bringing Disco to the middle-class household is confident his song will outdo `Munni` and `Sheila`. “‘Ooh La La…’ has already become a craze. It will rock the nation. I will be remembered for another 25 years for Ooh La La…’” said the veteran.