They were married last weekend at his Skywalker Ranch in California.
There are a lot of celebrities on hand for the fun at Chicago's Promontory Point.
Security was tight and so was parking, which is why some neighborhood residents are not happy about the event.
A cheer goes up for actor Robin Williams among the familiar faces drawing a crowd in Hyde Park.
"I think it's fantastic," said Hyde Park resident Delphine Williams. "It's wonderful to have something in Chicago as big as this."
Among those on the guest list were former Mayor Richard Daley, gubernatorial candidate Bill Daley, the Reverend Jesse Jackson, Grammy award-winning singer Ne-Yo and JP Morgan CEO Jamie Dimon. All of them getting together to celebrate the nuptials of Star Wars creator George Lucas and Chicago businesswoman Mellody Hobson.
"It's beautiful, and it's a reminder that with money comes privileges," said Hyde Park resident Christopher Deis. "So you have a billionaire and someone probably worth tens of millions of dollars getting married. They're going to do it right."
The reception at Chicago's Promontory Point along the lake comes a week after the happy couple tied the knot at Lucas's Skywalker Ranch in California.
The party was held in this massive tent, complete with an ivy wall and crystal chandelier that was set up on the grounds of The Point.
Besides Lucas and Hobson, the star attraction is a concert by singer Prince. Hyde Park high-rise resident Sherry Gutman said she could hear his rehearsal earlier in the day.
"He sounded great," she said. "I mean, the band sounded great. And it was just like Prince. It was really fabulous."
But not everyone is happy with the star-studded affair because of neighborhood parking restrictions and the lack of access to a popular point along the lake.
By 5:30 p.m. private security and Chicago Police had shut down a pedestrian tunnel, which was painted in recent days reportedly at taxpayer expense.
"This belongs at Northerly Island or at the country club at 71st and (Lake Shore Drive) where you have the facilities set up for it, and it wouldn't impact the people in the neighborhood."
Weddings at Promontory Point are common, but nearby residents said they've never seen a tent this large. Exactly how much the couple is paying to rent the public land is unclear.