For his part, Foxx has always been very secretive about his dating life.
The actor had a child in 2009, but has never divulged the identity of her mother.
actress, 36, “put on a wig and hat to meet him at a hotel.” PHOTOS: Katie's red carpet evolution The relationship is a multi-city operation: While Holmes, who has been filming All We Had in NYC, supported the Grammy winner, 47, following his Aug. The soon-to-be fourth grader, 9, the source adds, needed to be back in time for school. 7 trip to Disneyland while Mom visited Foxx’s Thousand Oaks, Calif. PHOTOS: Katie and Tom Cruise -- the way they were “Katie is so in love,” adds the insider.
The Woman in Gold actress, 38, and Foxx, 49, had dinner in South Beach on December 30, one insider tells Us of the duo, while a second source adds that to count down to 2017 the next night, the couple headed to Soho House Miami.
According to an eyewitness, Holmes and Foxx, who have been discreetly dating since October 2013, were spotted well after midnight “holding hands while walking near the pool” at the hotel and members-only club.
“They’re very serious,” the source tells Us, adding that Suri, Holmes’ 10-year-old daughter with ex-husband Tom Cruise, is well aware of their relationship.
Their New Year's Eve trip comes after Foxx jetted Holmes off to Cabo San Lucas, Mexico, to celebrate her birthday last month.
Six years later, in 2012, Holmes and Cruise officially filed for divorce.
Holmes, Foxx, and Cruise ran into each other during a Monday Night Football game and posed for a quick photo op.
"She's in panic mode and doing major backpedaling." MORE: How Did Jamie Foxx and Katie Holmes Meet?
A Look Back at the Couple's Long-Rumored Romance For the record, multiple sources have confirmed to ET that Foxx, 48, and Holmes, 37, are in fact dating.
As exclusively reported by Us, the Oscar-winning entertainer whisked Holmes away for the weekend for a “quick trip.” The lovebirds stayed in one of the most private suites at the luxe Las Ventanas al Paraíso resort.
"They wanted to be very discreet and had everything delivered to their room and taken care of by a personal butler,” a source told Us at the time.
In October of 2013, Foxx tried to throw the media off his trail.