A picture of Vidya Balan from a photoshoot for lensman Dabboo Ratnani (left above) was used to morph into a bikini pic of the actress.
The prankster who morphed the image first tilted Vidya’s original photo anti-clockwise (as done above) and then, with the use of simple photoshop tools, copied her face from the original photo and pasted it onto another photo of a bikini model. He/she carefully added the hair extensions in the bikini pic, again through copy-paste tool.
So if you look carefully at the two images above, you’ll see that the source of the second pic was the this particular one.