PIC: Pregnant Reese Witherspoon Stuns on Red Carpet Debut for White House Correspondents Dinner

Reese Witherspoon attends the 98th Annual White House Correspondents' Association Dinner on April 28, 2012 in Washington, DC. Credit: Stephen Lovekin/Getty Images

At last, Reese's bump is red carpet ready!

Over a month after  Us Weekly broke news of her third pregnancy, Reese Witherspoon walked her first red carpet as a third-time mom-to-be at Saturday's White House Correspondents' Dinner in Washington, DC.

The Oscar winner, 36, de-emphasized her growing bump in a sexy, slimming black dress, and wore her blonde locks up in a retro 'do reminiscent of her 1920s look in Water for Elephants, accessorized with turquoise earrings.

Witherspoon is in the nation's capital with CAA agent husband Jim Toth, and was spotted arriving in DC holding Toth's hand on Friday.

The This Means War star's baby-to-be will join older siblings Ava, 12, and Deacon, 8, Witherspoon's kids with ex Ryan Phillippe.

Tell Us: What do you think of Reese's pregnant red carpet style?