Reese Witherspoon 's recent appearance on our list of the sexiest dresses from this year's Oscars  had us thinking . . . is she a secret siren? America's sweetheart has certainly had some sultry looks along the way, starting with some dresses way back in the mid-'90s. Instead of charting all of her red carpet glamour, we're zeroing in on the most sizzle-worthy dresses of all.
A young Reese Witherspoon  was no stranger to the slinky LBD — complete with knee-high boots — at The House of Yes premiere in 1997.
Pink and a tulle-infused fishtail hem did not deter us from noticing just how sexy the low-cut neckline of Reese's pink dress was at the Legally Blonde premiere in 2001.
In 1996, Reese Witherspoon  was not afraid to show off a little skin, thanks to this midriff-baring ensemble at The People vs. Larry Flynt premiere.
For the 2002 Golden Globe Awards, Reese chose an eggplant-colored slipdress for the red carpet, and her choice totally reminded us of something altogether boudoir-inspired.
The bright orange hue of this mid-length dress showed off an ample amount of décolletage at the NYC premiere of Vanity Fair in 2004.
Reese wore this black lacy number to the Critics' Choice Awards in 2006.
Reese wore a knee-length LBD at the Toronto premiere of Penelope in 2006.
Reese chose a sexy lace Jason Wu dress to a cancer research benefit in 2010.
For the LA premiere of How Do You Know in December 2010, Reese looked ultrasexy in a strapless Zac Posen dress.
For the 10th anniversary Avon Foundation For Women Gala in October 2010, Reese went glam in a formfitting Jason Wu bustier dress.
Reese sizzled in a red asymmetrical dress and peep-toe heels at the Paris premiere of Water For Elephants.
Jaws dropped when Reese showed up to the London premiere of Water For Elephants in 2011. How'd she do it? She wore a sexy, stunning cobalt-blue dress by Stella McCartney.
Reese continued her Water For Elephants press tour in this stunning strapless Zac Posen dress that screamed "va va voom."
Reese looked fierce in a leopard-print Zac Posen mini at the MTV Movie Awards in 2011.
The actress tapped into her futuristic side in a black cutout Cushnie et Ochs dress in 2011.
For the 2012 Golden Globes, Reese played the lady in red in a gorgeous crimson-hued fishtail gown by Zac Posen.
Reese looked sexy and sassy in a beaded Miu Miu dress for the This Means War Los Angeles premiere in 2012.
Reese Witherspoon  stepped out postarrest at the NYC premiere of Mud in a leg-baring LBD by Saint Laurent. While the minidress featured an embellished neckline, she kept everything else simple, pairing the look with black pumps and a Saint Laurent clutch.
Reese Witherspoon  donned the sexiest kind of LBD — one with a sweetheart neckline and embellishments — to Benjamin Millepied's LA Dance Project inauguration benefit gala in LA in June 2013.
For a Chanel party in early 2014, she picked black skinnies and a lacy top that showed some skin through the thin fabric.
At a Hollywood Stands Up to Cancer event, a basic orange sheath had plenty of sizzle thanks to a low neckline.
In what might be her most daring look yet, Reese picked a black dress with a fairly skimpy top half for 2014's Vanity Fair Oscars party.