Madonna got emotional as she shared a throwback pic of her and three of her children on Twitter.

The global superstar , who is in the middle of a custody battle after her 15-year-old son Rocco fell out with her, has been looking through old photographs as he remains in London with his father Guy Ritchie.

She shared a snap of her holding onto son Rocco as he tries to run away while laughing, with daughter Lourdes and David looking on.

Madge captioned it: "Days of innocence. In Malawi. How I miss this time. #rebelhearts," along with a sad face emoji.

Rocco Ritchie
Rocco Ritchie is now living with his dad

The 57-year-old star is willing to "fight to the end" for custody of her son, reports claim.

He reportedly walked out of her Rebel Heart tour in December to stay with his father, who is said to have hired lawyers as he prepares to battle to retain custody of the teenager.

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"She is going to fight, fight, fight, and she is going to fight to the end," a source told People.

"She is not happy. She is an excellent mother, and people can say whatever they want – but her children mean the world to her."

Rocco Ritchie
Madonna and Rocco Ritchie in 2004

Rocco is now living with Guy, his wife Jacqui Ainsley and their three children, Rafael, four, Rivka, three, and Levi, 18 months, in the UK and Madonna is said to be worried that Rocco is missing school.

Explaining he has missed some school, a source said: "He should have been home already.

"Madonna is a devoted mother, and a big priority is her children's education."

The mother and son reportedly fell out after she confiscated his mobile phone.