Mila Kunis and Ashton Kutcher were spotted at a Robin Thicke concert in Chicago, Ill. Thursday, looking like they were having a good time.

The couple was there to attend the Taste of Chicago food festival, which also hosted musical acts like Thicke in between food-tasting sessions.

Kutcher was wearing a white T-shirt, blue jeans and a baseball cap while Kunis wore a simple gray shirt and black pants. Kutcher was photographed waving his arms enthusiastically in the air while singing along to one of Thicke's songs, according to Daily Mail. Kunis was seen right by his side smiling and glancing up at him several times.

See photos here.

American Boy singer Estelle also performed at Thursday night's show. Led Zeppelin lead singer Robert Plant will be performing a concert at the festival on Friday night.

The couple was also spotted on July 4 at the Oxford Parade in Iowa, where Kutcher was born and raised. Kunis was seen driving a monster truck in the parade with Kutcher in the passenger seat, according to a local reporter. They also did a meet-and-greet with local Democrats at the event.

New rumors surfaced recently that Kunis and Kutcher are intent on moving to London together. The couple had been in the capital for a few months while Kunis was filming her new movie Jupiter Ascending.  They were also spotted in mid-June on the beach of St. Tropez, France, engaging in some public displays of affection.

Kunis and Kutcher have gone on many double dates with Princess Beatrice and her boyfriend Dave Clark. Kutcher became friendship with Clark, who is a high-ranking official for the Virgin Galactic. Kutcher became traveler No. 500 to purchase a seat on the exclusive space-travel aircraft.

As for marriage possibilities, their former That '70s Show co-star Laura Prepon seemed to think that it was definitely on the way. She said her and the whole cast of the television show would be there on the altar with them if the couple ever got married.

Tags: mila kunis Ashton Kutcher robin thicke chicago