One Direction's Liam Payne said: "The pictures I have seen of little children in between the ruins made my heart break.
"All of us in the band are shocked by how many people need help, so we're asking the public to continue to be as generous as they possibly can."
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An attacker armed with a machete killed a woman and wounded two others in the southern German city, according to reports.
A swimmer has gone missing and two others were rescued by the coast guard after they got into trouble in the sea at Camber Sands.
Hundreds joined the party for Jerika Bolen, 14, who has decided to come off life support and allow herself to die later this year.