Mick Jagger Is a Great-Grandfather

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Mick Jagger

His granddaughter Assisi gave birth to a baby girl.

The Rolling Stones frontman Mick Jagger is a great-grandfather.

His 21-year-old granddaughter Assisi -- the daughter of his daughter Jade, with ex-wife Bianca Jagger -- gave birth to a baby girl with her boyfriend, chef Alex Key, 25, The Hollywood Reporter has confirmed.

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Assisi previously told Hello! magazine that Jagger, 70, was pleased when she told him the news of her pregnancy: "He said, 'Well done.' "

She added: "I imagine it's nice to be a great-granddad, although I'm not sure he likes the idea of getting old, or being called one. I call him Mick -- I wouldn't start calling him Grandpa."

(Jade, 42, is also expecting this month; she's due with her third child with graphic designer husband Adrian Fillary.)

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The news comes two months after Jagger's longtime girlfriend, fashion designer L'Wren Scott, committed suicide.

Following the tragedy, the Rolling Stones postponed their "14 on Tour" concert dates in Australia and New Zealand. The group is currently gearing up to resume its tour May 26 in Oslo, Norway.