Pregnant Reese Witherspoon says she's feeling 'very round' Timothy Hiatt / Getty Images Reese Witherspoon attends An Evening with Reese Witherspoon hosted by the Gene Siskel Film Center at The Ritz-Carlton Chicago on Saturday, June 23 in Chicago. Reese Witherspoon hasn't said much since Us Weekly broke the news of her pregnancy in March -- until now. During "An Evening With Reese Witherspoon," hosted by the Gene Siskel Film Center at The Ritz-Carlton in Chicago June 23, the star admitted that "frankly, I'm feeling very round tonight." Witherspoon wore a cap sleeve Vanessa Bruno dress. PHOTOS: Reese Witherspoon's body evolution When a Chicago Sun Times reporter suggested she should avoid foods like the city's famed deep-dish pizza, Witherspoon, 36, laughed and said: "Maybe, but it's not easy. I'm always feeling like I'd like to eat everything in sight! PHOTOS: Reese Witherspoon's best hairstyles ever The "This Means War" actress -- who will welcome her first child with husband Jim Toth, 41, this fall -- said she's "very excited" about becoming a mother for the third time. Witherspoon shares custody of daughter Ava, 12, and son Deacon, 8, with ex-husband Ryan Phillippe, 37. PHOTOS: Reese Witherspoon's life as a newlywed Witherspoon is currently shooting "Devil's Knot" in Atlanta with Colin Firth, 51. "It's about a crime that occurred in 1993," she told The Chicago Sun Times. It happened in Arkansas, and it's what I'd say is a very American story. And, after I finish that, I'm going to take a little time off -- and go have a baby!