Things are getting serious between Katie Holmes and Jamie Foxx!

According to reports, the 37-year-old actress had a girls day with her daughter Suri Cruise, 9, and her boyfriend's daughter Corinne Foxx, 21. While the couple has been trying to keep their relationship a secret for over two years, the ladies were all spotted having lunch together in Beverly Hills.

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“Katie and Suri [Cruise] and Corrine [Foxx] were all at the Honor Bar together having a girls day out,” an eyewitness told Radar. “Corinne was so cute with Suri, and the three of them looked like they were having a lot of fun together.”

suri cruise corinne fox – getty

Suri Cruise (left) and Corinne Foxx (right).

“They were all so relaxed with each other, it seemed like they knew each other really well and spent time together before this day,” they added.

The couple recently sparked marriage rumors when they both showed off gold diamond sparklers on their left ring fingers – which led many to believe that they're wedding bands.

jamie foxx katie holmes rings – getty

However, if the 48-year-old has any say in it, the world will never find out. In an interview with Oprah Winfrey in 2013 the actor revealed, "I can be in a monogamous relationship, but my motto is, whoever you date, don’t let people know."

In fact, he's so secretive that the public doesn't even know who the mother to his children is!