Congratulations are in order for Ashlee Simpson. The star announced her engagement to actor Evan Ross via Twitter this week, and we got the scoop on her unique engagement ring straight from the designer. The 5-carat marquise-cut diamond, set in platinum and gold, and accented with small rubies and 140 small white diamonds, is the work of jeweler-to-the-stars Neil Lane (he's the man behind some of the most jaw-dropping sparklers in Hollywood, and is responsible for many of the dazzling diamond creations the stars wear on the red carpet). "A Vintage inspiration with a Contemporary feel using calibrated cut rubies gave that vibrant Art Deco look," Lane told InStyle.com exclusively. “The navette shape evoked the romance [of the] Edwardian Era." Based on her ever-evolving style, we’re looking forward to seeing what she wears down the aisle.