Jennifer Garner, Boyfriend John Miller Hit Major Relationship Milestone: Report

Jennifer Garner and boyfriend John Miller's relationship appears to be going strong.

The "Adam Project" star, who turned 50 over the weekend, celebrated her birthday with a food drive Saturday, and among her special guests were her boyfriend's children.

"John's kids finally met Jen's kids," an unnamed source told Us Weekly. "Lots of kids and family were invited, including John's kids, his parents, his brother and his [brother's] wife."

Garner shares three children with her ex-husband Ben Affleck: daughters Violet, 16, and Seraphina, 13, and son Samuel, 10. Miller, for his part, shares two children with his ex-wife Caroline Campbell.

"They all had friends there," the source continued. "It was casual and easy."

Garner and Miller have kept their relationship low-key. Their romance first made headlines in October 2018 after her divorce from Affleck was finalized. At the time, reports said that the couple had been seeing each other for six months.

"Jen brings out the best in John, and he is the happiest he has probably ever been," an unnamed source told Us Weekly. "It’s a loving, healthy relationship."

However, Garner and Miller split less than two years later. An insider told the outlet in 2020 that the CaliGroup CEO was ready for marriage, but Garner wasn't ready to commit.

Then, less than a year after the breakup, a source told Us Weekly in May 2021 that "Jen and John are back on. It started up a few weeks ago."

In August that year, Garner and Miller were photographed out and about in New York City together. An eyewitness told E! News that the actress arrived by car to pick up the businessman at an apartment building. They reportedly tried to be discreet as they left.

A month later, Garner and Miller were spotted taking a stroll through downtown Manhattan. In photos obtained by People, the pair were holding cups of coffee during their casual walk.

Garner's children have already met their dad's fiancée, Jennifer Lopez, and her 14-year-old twins, Emme and Max. The blended family even spent Halloween together.

"Everyone gets along and the focus is always on the kids. Jennifer, Ben and Jen Garner all wanted the kids to have an amazing Halloween," an unnamed source told People at the time. "The kids are friends and wanted to go trick-or-treating together. It made sense that they all went together."

Jennifer Garner attends the 6th Annual Save the Children Illumination Gala at the American Museum of Natural History on November 14, 2018 in New York City. Photo: Getty Images/Noam Galai