Reese Witherspoon is ''very excited'' about her pregnancy.

The 36-year-old actress - who has two children, Ava, 12, and Deacon, eight, with ex-husband Ryan Phillippe - has spoken for the first time about her and spouse Jim Toth's unborn baby, and admitted she is feeling ''very round''.

Speaking during 'An Evening with Reese Witherspoon' hosted by the Gene Siskel Film Center at The Ritz-Carlton in Chicago on Saturday (23.06.12), she said: ''I'm very excited ... Frankly, I'm feeling very round tonight.''

The 'This Means War' actress also admitted pregnancy had left her with a huge appetite.

When it was suggested she avoided foods like Chicago's famed deep-dish pizza, she told the Chicago Sun Times newspaper: ''Maybe, but it's not easy. I'm always feeling like I'd like to eat everything in sight!''

Although Reese won't confirm her due date, she admitted she will be taking a break once she finishes filming 'Devil's Knot' in Atlanta with Colin Firth.

She said: ''It's about a crime that occurred in 1993. 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!''