Celebrity 17 Dazzling Star Sparklers These gems have five Cs: cut, color, clarity, carats and celebrity! See the big bling worn by Hollywood's most engaging women By Kate Hogan Published on September 4, 2012 07:00 PM Share Tweet Pin Email Trending Videos 01 of 17 SCARLETT JOHANSSON INF. Inset: Ian Gavan/Getty Johansson is "very happy" to be engaged to journalist fiancé Romain Dauriac – and is likely just as happy about her extra-large ring. The bauble, which Dauriac presented to the actress when he proposed in August 2013, is a vintage Art Deco design. 02 of 17 KATIE COURIC Landov; Inset: Polaris The talk-show host was "stunned" by love John Molner's August 2013 beach proposal, and probably just as stunned when she saw the supersized diamond ring he presented to her. The bauble features a large square-cut stone framed by smaller diamonds, all atop a delicate band. 03 of 17 ASHLEY TISDALE Jason Merritt/Getty. Inset: Splash News Online Rocker Christopher French popped the question to Tisdale in August 2013 atop one of New York City's finest buildings, and gave her an even finer ring to go with the romantic gesture. The sparkler really sparkles, because it's a multiple-carat cushion-cut diamond surrounded by a halo of small diamonds, set on a platinum band … covered in diamonds. 04 of 17 HOLLY MADISON Denise Truscello/Wireimage. Inset: Alan Schwartzman When the former Girls Next Door start got engaged in June 2013, it was her ring that really got people talking. Her 18-carat cushion-cut yellow diamond is surrounded by pink and yellow diamonds, and features hidden touches like an engraving of an owl. Madison asked her fiancé, Pasquale Rotella, to design the ring himself, "because I told him that's what would make it most special," she told PEOPLE. 05 of 17 KELLY CLARKSON Lester Cohen/Wireimage(2) Here's something to sing about: Clarkson's whopper of a canary diamond, situated on a diamond band. "They did an amazing job," Clarkson Tweeted of fiancé Brandon Blackstock and jewelry designer Johnathon Arndt, who worked together to create the shiny stunner, which Clarkson received in December 2012. 06 of 17 AVRIL LAVIGNE Robb Dipple One thing wasn't complicated about Lavigne's engagement to Nickelback's Chad Kroeger: the ring. The Canadian rocker chose a 14-carat, pear-shaped jewel to present to his girlfriend of six months when he got down on one knee in August 2012. 07 of 17 ANNE HATHAWAY Johns PKI/Splash News Online; Inset: Landov In November 2011, Hathaway's longtime love Adam Shulman – a part-time jewelry designer – presented his bride-to-be with an emerald-cut Kwiat diamond ring he helped create. "He had a very strong vision for what he knew Anne would love," jeweler Greg Kwiat told PEOPLE. 08 of 17 REESE WITHERSPOON Kevin Mazur/VF11/WireImage In December 2010, Witherspoon's now-husband Jim Toth presented her with a rare 4-carat Ashoka diamond ring set on a pavé diamond-and-platinum band. 09 of 17 KRISTIN CAVALLARI Splash News Online (2) It's so nice, she's worn it twice! The reality star sported this square-cut stunner from now-husband Jay Cutler when the two were engaged in April 2011. Though they briefly separated that summer, the couple gave their relationship another shot that November – and Cavallari's been wearing the same ring ever since. 10 of 17 JESSICA SIMPSON Kevin Mazur/Wireimage; Inset: CBS/INF According to jeweler Neil Lane, Eric Johnson wanted "the most romantic, beautiful, special ring" for his November 2010 proposal to Simpson. So he selected a three-stone sparkler with a 5-carat central ruby (the bride's birthstone) flanked by two pear-shaped diamonds that together total 5 carats. 11 of 17 KATE HUDSON Peter Kramer/NBC; Inset: Flynet "How can you not notice that ring?" Matt Lauer asked Hudson when she flashed her emerald-cut dazzler – an April 2011 gift from fiancé and Muse singer Matthew Bellamy – during an appearance on Today. 12 of 17 NATALIE PORTMAN John Shearer/Getty; Inset: Michael Buckner/Getty To align with Portman's earth-friendly ways, now-husband Benjamin Millepied called on former dancer pal and jewelry designer Jamie Wolf to create a ring made of conflict-free stones and recycled platinum for their December 2010 engagement. 13 of 17 NICOLE RICHIE Henry Lamb/Photowire/BEImages; Inset: WireImage Joel Madden wanted his lady love to have her dream ring when they got engaged in February 2010, so Richie designed it herself, working with Neil Lane to create what he calls a "beautiful, special" 4-carat round diamond stunner. 14 of 17 CATHERINE, DUCHESS OF CAMBRIDGE Chris Jackson/Getty Before receiving her royal title, Kate received a royal bauble from Prince William in November 2010: the sapphire-and-diamond ring Prince Charles used to propose to Princess Diana. The 12-carat oval Ceylon sapphire is surrounded by 14 diamonds and set in 18-karat white gold. 15 of 17 LEANN RIMES GSI; Inset: WireImage Rimes knew she wanted a fleur-de-lis incorporated into her ring, which she received in December 2010, but let now-husband Eddie Cibrian lay out the rest of the sparkler, which includes single-cut pavé and rose-cut diamonds that give the central 5-carat oval-cut gem an antique feel. 16 of 17 KRISTEN BELL Lester Cohen/WireImage; Inset: Courtesy Neil Lane Dax Shepard picked a perfectly unique bauble for fiancé Bell in late 2009: a fancy-colored, emerald-cut diamond weighing more than 3 carats and set in platinum with small white diamond accents. 17 of 17 CARRIE UNDERWOOD Lionel Hahn/Abaca; Inset: Landov The country star never spoke openly about her engagement ring from now-husband Mike Fisher (he proposed in December 2009), though a spokesperson from the Diamond Information Center estimated that the Johnathon Arndt stunner, which is anchored by a flawless yellow diamond, is worth $150,000.