As her kids get older,Jennifer Garner‘s belovedMother’s Daytradition has gotten a little trickier to pull off.

“All my kids sit on my lap every Mother’s Day [for a photo],” says the actress, 47, who currently graces the cover ofPEOPLE’s 2019 Beautiful Issue. “But they’re getting bigger and it’s hilarious.”

“It used to be that [Samuel Garner, 7,Seraphina Rose Elizabeth, 10, andViolet Anne, 13, her children with exBen Affleck] could fit, and now we just have to stack them and it’s a disaster,” she shares with a laugh.

But the kids still enjoy it, says Garner: “They’re like, ‘Mom when we’re 24, 21 and 18, we are sitting on your lap.’ And I’m like, ‘Great, I’ll keep my bone density up. That’s my part in this equation.’ ”

Jennifer Garner

Jennifer Garner

Jennifer Garner

Back at home, Garner is relishing every minute with her own children, including a newly minted teenager.

“She seems so grown up and independent and in control of what she wants to do,” the13 Going on 30star says of Violet, who turned 13 in December. “She really has her stuff managed. I don’t say to her, ‘Have you done your homework?’ She’s on top of it.”

Asfor Garner’s Beautiful cover? The kids put it into perspective. “They were kind of like, ‘Why is this you?’ ” she says. “My son said, ‘This is ridiculous!’ “

source: people.com