Beast of Birthin': Mick Jagger, 72, Having His Eighth Child With Ballerina Girlfriend, 29

You can't always get what you want, unless it's an 8th kid.

Mick Jagger is set to become a dad for the eighth time as it's been revealed the 29-year-old girlfriend of the Rolling Stones frontman is expecting.

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A representative for the 72-year-old rocker, who will turn 73 later this month, confirmed the news that Jagger and ballerina Melanie Hamrick are pregnant.

The two began dating in 2014 and it will be the couple's first child. Jagger has seven children — ranging in age from 45 to 17 — with four different women and five grandchildren.

He also has one great-grandchild.

The baby news comes just two months after Jagger's 69-year-old Stones bandmate, guitarist Ronnie Wood, had twins with his 38-year-old wife, Sally Humphries.

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It was Wood’s first children with Humphreys, whom he married in 2012, when he was exhibiting his art at a London gallery.

Wood has one son, Jesse, 39, with his first wife, former model Krissy Findlay.

Watch: Woman Gives Birth In Her 70s For First Time, and Even Breastfeeds