The Alias alum, 51, also blew a kiss to her love as she walked away from his vehicle.
Jennifer wore a pair of black leggings and a gray sweatshirt and had her hair pulled up into a messy ponytail.
The 13 Going on 30 star is a busy mom and actress but she makes time for romance with Miller, 41, as the two have been linked since 2018.
Garner and Miller have kept their relationship low key and under the radar over the years.
He is an attorney and the CEO of CaliBurger, a burger restaurant chain with 50 locations.
‘She loves how little he cares for the limelight or the whole Hollywood scenester stuff,’ a source told Us Weekly last year.
‘You’ll never see them ham it up for the cameras or fixate about what events to attend together, it’s just not their style.
‘They’re happier being a regular, under-the-radar couple and don’t need anyone else’s validation to know they’re meant to be together,’ the source explained.
‘Jen brings out the best in John, and he is the happiest he has probably ever been. It’s a loving, healthy relationship.’
Garner met Miller several year after separating from her husband of 10-years, Ben Affleck, in 2015.
They filed for divorce two years later and it was finalized in 2018.
The former A-list couple share three children: Violet, 17, Seraphina, 14, and Samuel, 11.
They amicably co-parent and Affleck is now married to pop superstar Jennifer Lopez, 54, who he first dated and got engaged to in the early 2000s.
They split in 2004 but reconnected in May 2021 following Lopez’s split from then-fiance Alex Rodriguez.
DailyMail.com exclusively revealed earlier this year that Garner has a good relationship with her ex-husband’s new wife and that there is ‘no animosity’ between them.
Garner’s latest LA outing comes days after her Alias co-star and real life best friend Victor Garber, 74, opened up about the Type 1 diabetes he was diagnosed with when he was 11 years old and how Garner helped him when they starred on the ABC spy series together.
‘It’s been written about it, and I’m happy to say we are very close,’ he told CNN.
‘You know, I remember, I can tell you we first met that her concern for looking after me on the set, given my diabetes, was one of the most important things to her,’ he explained.
‘And so she was always saying, ‘I think he needs some orange juice.’ And I would say, ‘Jennifer, I’m fine.’ She said, ‘you’re not, I could tell.’
Garber said he wasn’t as public about his diabetes during the time that Alias was on the air from 2001 to 2006.
‘I was not embarrassed, but when you feel like you’re compromised in some way, you don’t want people to dote over you or to worry about you,’ he said.
‘I kept it kind of under my sleeve,’ Garber added. ‘Jennifer was one of the first people who really, you know, kind of educated people all around me on the crew and everything.
‘And she sort of brought it out in the open, which was incredibly generous and helpful because, there were days when I wasn’t sure what was happening, and she was able to set me straight.’