Insiders close to the situation say Anstead and Zellweger met earlier this month while shooting an episode of Celebrity IOU Joyride, his new show on Discovery+.
The sources said that after filming, Renée actually came back to set to return some work boots for Ant.
Though the timeline of when things turned romantic between the two is a bit murky, the insiders say they are definitely an item now.
As Radar previously reported, Anstead and Haack reached their divorce settlement earlier this week in Orange County court. The finalization was reached fairly easily since they had a prenuptial agreement in place before they got married in December of 2018.
She filed for divorce less than two years later.
Via their joint filing, the ex-couple submitted to the court items like providing insurance and distribution of personal items from the family home, officially ending their short-lived marriage and relatively quick divorce.
Together, they have one son – 20-month-old Hudson Anstead – and as of now, they seem to be sharing joint custody.
Christina had previously begged the judge in their divorce case to speed up the process after Ant was a no-show in court.
She also recently put their $6 million Newport Beach home – which contains five bedrooms and four-and-a-half bathrooms in its 4,804 square feet of living space – on the market. After they tied the knot in the beachy abode, Ant handed over his rights, giving his then-wife full ownership of the house.
Anstead and Haack said "I do" just months after she finalized her divorce from her first husband, Tarek El Moussa. He and Christina share two children: 10-year-old daughter Taylor El Moussa and 5-year-old son Brayden El Moussa.
Tarek is currently gearing up to wed his Selling Sunset fiancée, Heather Rae Young.
As for Zellweger, she was previously married to country star Kenny Chesney, but the two have been divorced since 2005. Most recently, the actress was linked to musician Doyle Bramhall II.