Carrie Underwood debuted her tiny baby bump this past weekend at the Ravinia Festival in Illinois -- see pictures of the pregnant star here! Credit: FameFlynet Pictures

Itty bitty baby bump! Carrie Underwood, who's currently expecting her first child with husband Mike Fisher, showed off her tiny baby bump while performing at the Ravinia Festival on Saturday, Sept. 6, in Highland Park, Ill.

The American Idol winner, 31, looked fashionable and comfortable in a floral-printed jumpsuit by Katherine Feiner, which accentuated her small bump. Underwood left her blonde tresses down in loose waves and completed her look with a pretty smoky eye.

She also seemed very pleased with the outcome of her two sold-out shows, tweeting thanks to her fans on Monday, Sept. 8.

This will be the first child for Underwood and her husband of four years, 34. The Grammy-winning country singer announced her pregnancy to fans last Monday, Sept. 1, with an adorable Instagram post. Underwood's rep also confirmed the happy news directly to Us Weekly.

"In honor of ‘Labor’ Day, Ace & Penny would like to make an announcement," Underwood wrote. "Their parents couldn't be happier…" The pregnant star accompanied her caption with a cute pic of her two dogs wearing shirts scrawled with the words: "I'm going to be a big sister" and "big brother."

This past April, Underwood and NHL pro Fisher updated Us on their marriage at the Time 100 Gala in NYC. "We actually went away a few months ago to Turks and Caicos for the Olympic break," Fisher recalled. "It was just awesome. It was nice to get away." The hockey pro added that he and his wife like to indulge in the occasional romantic date night, complete with dinner and wine.

Country music's princess, meanwhile, told Us at the same event that she was looking forward to spending summer with her hubby and his family in Canada. "I like lakes," she said. "I like to be able to go fishing or be on a boat with friends, grilling."