Disgraced university undergraduate Charlie Gilmour was caught on camera clambering over the Cenotaph war memorial in December 2010, when a demonstration against an increase in college tuition fees turned violent.
He was arrested days later and accused of involvement in an attack on a car carrying British royal Prince Charles, Prince of Wales and his wife Camilla Parker Bowles during the riots, and smashing a store window in a separate incident on the same day.
On Friday, Gilmour attended a hearing at Kingston Crown Court in south west London and pleaded guilty to violent disorder. It was not specified which incident he admitted to.
The 21 year old, an adopted son of Pink Floyd's lead guitarist and singer David Gilmour, who is a student at acclaimed Cambridge University, was warned he faces a possible prison term when he is sentenced later this year.
Judge Nicholas Price, QC, told Gilmour, "You must understand that your plea of guilty to violent disorder is a serious matter and it may be that the proper course would be one of immediate custody."
Charlie Gilmour, who apologized for his behavior in a statement after the riots, is due back in court on July 8. He was freed on conditional bail so he can complete his university exams.