*Usher’s 11-year-old stepson, Kyle Glover — whose mother is wife Tameka Foster — is in critical condition in an Atlanta hospital after he was struck by a jet ski.

Young Glover, 11, and a 15-year-old girl were on an inner tube towed by a speedboat on Lake Lanier when the jet ski – operated by a man in their group – hit the tube, TV station WXIA reports.

Sources say that Glover was hit in the head and was unresponsive when he was taken out of the water.

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Glover and the girl, whose name was not released, sustained serious injuries and were evacuated to a nearby hospital, where they remain in critical condition.

TMZ reports that despite Usher’s acrimonious divorce from Foster, he chartered a plane for Tameka, who was out of town, to be by her son’s side.

Sources say she was extremely thankful for Usher’s grand gesture and she rushed immediately to be by her son’s side.