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Rock veteran Sir Mick Jagger is a great-grandfather.

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The Rolling Stones frontman's granddaughter Assisi has given birth to a baby girl, according to Hellomagazine.com.

No further details have been revealed. The tot is the 21-year-old's first child with her chef boyfriend Alex Key.

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The arrival means Assisi's mother, socialite and jewelery designer Jade Jagger, is a grandmother at 42. She is also currently expecting a child.

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The pair celebrated in March with a joint baby shower.

The birth is some happy news for the Jagger clan, which was rocked following the suicide of Mick's longtime girlfriend L'Wren Scott in March.