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Beloved celebrity Jennifer Garner frequently makes headlines for her comings and goings with longtime boyfriend — possibly fiancé — John Miller. Add in public outings with her ex-husband and A-list actor Ben Affleck as they all co-parent, and you’ve got a recipe for tabloid fodder. Miller tends to take all of the attention in stride. He’s also divorced and amicably raising kids with his ex-wife. So, who is Miller’s ex, Caroline Campbell, and how does she fit into the family unit?

Who is John Miller’s ex-wife, Caroline Campbell?

John Miller and Caroline Campbell married in 2005. Although it’s unclear how the businessman met his wife of 13 years, they both lived in California before getting together. The pair share two children, a 16-year-old daughter, Violet, and a recent high school graduate, Quest. After over a decade of marriage, Miller and Campbell divorced in November 2018. That same year, Miller began dating Garner. Campbell officially moved on in 2021, marrying businessman and competitive distance runner Christopher Estwanik.

Campbell is a violinist who performs classical, jazz, film, and popular music. For many years, she was the first violinist of Sonus Quartet. During her time with this LA-based string quartet, they recorded compositions for movies like The Lone Ranger, Transformers, Spider-Man, and The Curious Case of Benjamin Button.

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Campbell is likely not so starstruck by Garner as she’s used to spending time with celebrities. She’s recorded music and performed with Stevie Wonder, Norah Jones, Gnarls Barkley, and Chris Botti. The Albany, New York, native regularly posts on Instagram. A recent photo detailed Campbell’s work trips to Park City, Utah, Napa Valley, California, and Europe as she performs worldwide with Botti and others. Another post showed her with Quest, who graduated from high school in Santa Monica this past spring.

Caroline Campbell’s relationship with Jennifer Garner

Try as they might, tabloids have not been able to find much tension or a fraught dynamic between all of these co-parents. Garner and Campbell’s relationship appears to be a respectful arrangement. Earlier this year, TMZ spotted Miller and Campbell getting into the same car as part of their parenting responsibilities. The ex-spouses seem to display the same commitment to co-parenting as Garner and Affleck.

Earlier, in 2022, Us Weekly reported that Garner and Miller’s kids finally met for the 13 Going on 30 star’s 50th birthday. “Lots of kids and family were invited, including John’s kids, his parents, his brother, and his [brother’s] wife,” a source told the outlet. Notably, both the actor and CaliGroup CEO have daughters named Violet, though Garner’s is three years older, currently 19. Seraphina, Garner and Affleck’s middle child, is 16, the same age as Miller and Campbell’s daughter, Violet.

Although it’s unclear how much time Garner and Campbell have spent together, fans assume things are quite amicable given the drama-free relationships with their exes. A source told People that Garner and Miller are “better than ever” and have “hit a stride as a couple” in 2025.

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