This Mason by Michelle Mason Knot Dress, which Madonna rocked for her appearance on TRL, may just be the world's most fabulous party dress. With a deep V in the front and a diamond-shaped cut-out in the back, it's flirty, sassy, and dead sexy. Better yet, the stretchy rayon blend is so comfortable, you'll feel like you're wearing a t-shirt. It's also very versatile. Here, Kate Walsh wears it ladylike with summer wedges, while a Fabsugar editor shows off a sexy nighttime look:

The dress is available for $275 here in a variety of colors. To see a similar but amazingly affordable version of the dress, read more

Here's the best part: If you don't feeling like paying $275 for the look, Victoria's Secret has just come out with a similar style with the same front knot, cut-out back, and asymmetrical hem. Buy it here for just $65.

Pair it with some Fangol Florals or Silicone Gel Petals to feel comfortable and carefree. To prevent visible panty lines, wear a pair of Spanx.

Source: Madonnalicious.com