Lauren Martell claims to have witnessed an alleged incident involving Rolf Harris in the bathroom of a London music studio in the early 1990s.
The woman contacted the Metropolitan Police in November when she first heard of the investigation into Jimmy Savile.
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The German bomb - a 500kg device - was spotted by a barge carrying out dredging works, the Royal Navy said.
The study found children born in the 1980s have found it much harder to build up wealth in housing and pensions as they age.
The singer ended speculation over who would perform by saying "the rumors are true" to her 63 million Twitter followers on Friday morning.