Mick Jagger is about to become a dad. Again.

Mick Jagger of the Rolling Stones performs at the Indianapolis Motor Speedway in 2015. (Barry Brecheisen/Invision/AP)

A publicist for the 72-year-old rocker confirmed to Billboard magazine that the current girlfriend of the Rolling Stones frontman — 29-year-old American ballerina Melanie Hamrick — is pregnant. The child will be Jagger's eighth. Jagger has seven other children, from four previous relationships. According to the Sun tabloid, which first reported the news, Hamrick is more than three months pregnant.

Let's deconstruct the Jagger family tree a bit. Jagger's seven children range in age from 45 to 17. He has five grandchildren, and in 2014 became a great-grandfather when his then-21-year-old granddaughter, Assisi Jackson (daughter of Jade Jagger) gave birth to a baby girl. Still with us? Complicating things further, Jade herself was pregnant at the same time, giving birth to a baby boy just one month after she became a grandmother at age 42.

Feel free to take a moment and reread that last paragraph.

American Ballet Theatre dancer Melanie Hamrick attends the ABT’s 75th Anniversary Diamond Jubilee Spring Gala at the Metropolitan Opera House on May 18, 2015, in New York City. (Dimitrios Kambouris/Getty Images)

Jagger's granddaughter, Assisi, is 24 — just five years younger than his girlfriend Hamrick. Jagger began dating Hamrick after the 2014 suicide of his longtime partner, fashion designer L'Wren Scott. Hamrick has been a member of the American Ballet Theatre's corps de ballet since 2004.

Right now you're probably asking yourself: What exactly will be the relation between the new baby Jagger and Jagger's great-granddaughter, who turned 2 in May? Great-great-uncle (or aunt)? Do they make onesies for that?

All this is likely old hat for the "Satisfaction" singer, who's in good company. Just six weeks ago, Jagger's bandmate, 69-year-old Ronnie Wood, and his third wife announced the birth of twin girls. Maybe the Stones should set up a traveling nursery for their next tour.