File this under "Things that Aren't Supposed to Happen in Rock N' Roll." Mick Jagger is about to become a great-grandfather.

The Mirror, the famous U.K. tabloid, reports broke the news that Jagger's granddaughter Assisi is three months pregnant. Her boyfriend, Alex, is a chef. They have been together for more than a year. Assisi is the 21-year old daughter of Jade Jagger, the only child of Mick and Bianca Jagger, who were married from 1971-78. Last summer, Jade married DJ Adrian Fillary.

According to an unnamed source quoted in the article, the couple broke the news to their families last week. "Mick is delighted and has no qualms about being a great-grandfather," the person said. "He’s been joking about becoming a great, great, granddad and still performing!”

A father seven times over, the 70-year old Mick Jagger has three other grandchildren, Assisi has a younger sister, Amba. Karis Hunt, Jagger's daughter with model/actress Marsha Hunt, has two children of her own.