Representatives for the creator of Star Wars announced the birth Monday.
Lucas and Hobson, who is president of Ariel Investments, were married in June.
In July, their wedding reception-- attended by many Hollywood stars and high profile Chicagoans-- was held at Promontory Point.
The baby is named Everest Hobson Lucas.
She is the couple's first child and was born Friday via surrogate.
Lucas has three adult children from a previous marriage.