Joanna Dennehy told the judge as she pleaded guilty to murdering three men , "I've pleaded guilty and that's that".
Dennehy also admitted "preventing the lawful and decent burial" of all three murder victims.
Her shock guilty pleas left the courtroom at the Old Bailey stunned.
The defendant's barrister, Nigel Lickley QC, said: "The course of the arraignment is not one we had anticipated."
More top news
The 1D star will go ahead with his scheduled performance as per the wishes of his late mother, Johannah Deakin, who passed away on Friday.
Michael Gove admitted he made "mistakes" in his bid for the Tory Party leadership, and Theresa May was right to drop him from her cabinet.
Four people have been killed and at least 12 injured after a cargo train carrying propane-butane derailed and exploded in Bulgaria.