Jennifer Hudson sparkles in plunging Ralph&Russo couture black gown

She needs little excuse to show off her trim figure. But Jennifer Hudson has not only managed to change her body shape, but she has also kept her slim physique.

The 30-year-old signer looked incredible as she took to the stage at the Smith Center in Las Vegas on Saturday night.

It wasn't just her vocal ability that impressed she had also donned a gorgeous Ralph &Russo couture dress for the performance. The dress not only nipped in at Jennifer's tiny waist but it also boasted a plunging lace panel for a racy look.

And if the audience needed reminding of her star status she was shining bright in the frock which also boasted sequin detail.
more pictures after the break...