Aminur Nazir Khan, who's nineteen, will appear at Thames Magistrates' Court today.
He is charged with the murder of 16-year-old Ajmol Alom who died of a stab wound to his thigh.
Detectives have also arrested a second 19-year-old man on suspicion of murder.
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George Michael died in December last year at the age of 53.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Those gathered on the bridge fell silent at 2.40pm - the time the first call was made to police exactly seven days ago.