J.Lo's back on the block as she shows off her bumps in a figure-hugging white dress :

She is playing a pregnant single mother. But Jennifer Lopez still went for maximum sex appeal in a white fitted sheath dress on the set of her new movie The Back-Up Plan.

The dress clung in all the right places showing off the singer's curvaceous figure - complete with perfectly formed prosthetic bump.

But it looks like her most famous asset might also have benefited from a some of the magic of the movies as she also looked somewhat larger in the bottom area.

J.Lo - also nicknamed La Guitarra because of her curvy physique - cut an impressive figure in her brilliant white dress.

Her stunning look was in stark contrast to Sunday's scenes which saw the actress soaked to the skin and looking bedraggled after getting caught in a downpour on the streets of New York.

The 39-year-old shivered between takes as she was covered in water from a rain machine in Manhattan on Sunday.

Her character Zoe tries to hail a cab on a rainy day in New York and gets completely soaked in the meanwhile.

With her soft brown waves turned to wet frizz and her clothing completely wet, J.Lo looked far from her usual glamorous self.