Grandpapa is a Rolling Stone

Mick, 73, visits his baby boy (but can he lift him?):

If Mick Jagger wasn’t rock royalty, his family would be on Jerry Springer.

The prolific, 73-year-old baby-daddy was in New York recently to visit his eighth, and youngest, child.

Deveraux Octavian Basil Jagger — “Dev” for short — is, at age 6 months, just the latest chip off the old Rolling Stone.

Prior to that, the last baby born into the Jagger clan, in 2014, was Ezra Jagger — Mick Jagger’s first great-grandchild.

The two tots could have a lovely play date some day — even though Dev is Ezra’s great uncle. Yikes!

Ezra, incidentally, is the son of Assisi, who is the eldest daughter of Jagger’s second daughter, Jade, 45.

Jagger and little Dev’s mother — the svelte, Virginia-raised Melanie Hamrick, 30 — have been dating since 2014.

A dancer with the American Ballet Theatre, Hamrick took the briefest of maternity breaks to deliver Jagger’s latest baby, getting back en pointe in two months. She recently performed in “Swan Lake” at the Met. As The Post’s Page Six has reported, Jagger and Hamrick are rarely in the same place at the same time.

But last Saturday (above), they enjoyed a romantic dinner at the Italian restaurant Masseria Dei Vini, with Jagger in a jacket and sneakers and Hamrick in ripped jeans and heels.

Then they retired to her Up- per West Side apartment, from which Jagger emerged alone the next day — Father’s Day.

He zipped away in a chauffeured car, and Hamrick left the apartment soon afterward, taking the chubby tot to play on swings at a nearby park.

Friends have told Page Six that Jagger initially had mixed emotions about the pregnancy.

“He is unhappy at the thought that when he should be teaching his kid to play catch, he’ll be 80 years old,” one pal confided.

But Jagger has since warmed to another fatherhood stint, despite the big support bills. “The deal works out at [$190,000] a year, and then housing on top of that,” a source told MailOnline.