India, April 24 -- Kevin Costner stirred up fresh buzz on Monday, April 22, when he was seen having lunch in Los Angeles with a "mystery" woman. Is this the Yellowstone star's new flame? Or someone else?

Radar Online reported that the woman accompanying the 70-year-old actor is actually his longtime assistant, who's been working closely with him for the past two years. The lunch was all business, a work-related meeting, not a date. The two have been lensed together before, such as on an errands run to the expensive Erewhon Market in Calabasas.

Costner officially ended his 18-year marriage with Christine Baumgartner in February 2024. "Kevin still harbours resentment and anger toward Christine. She's far from his biggest fan, too. It is s...