Two-year-old Keanu Williams became "invisible" to the authorities while being subjected to months of cruelty, a damning report has found.
The Serious Case Review into the toddler's murder concluded that the professionals involved in his care failed to meet even basic standards of good practice.
Birmingham Safeguarding Children Board's independent report said child protection workers in various agencies "collectively failed" to prevent Keanu's death.
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The singer, 31, said on Twitter that she and her partner Jonathan Powell were grieving their loss.
A fine evening ahead to the south with some late sunshine in places.
Prince Charles and the Duchess of Cornwall have visited Manchester Arena, the site of a suicide bombing in May which left 22 people dead.