Charlie Gilmour, son of Pink Floyd, guitarist David Gilmour, has pleaded guilty to Violent Disorder during the student fees riots.
The Cambridge University undergraduate was charged with violent behaviour during the trouble on December 9 which saw an attack on a royal convoy of cars carrying Prince Charles and his wife the Duchess of Cornwall.
The 21-year-old will be sentenced on July 8 - a date agreed by the court to allow Gilmour time to finish his end of year exams.
The judge, His Honour Nicholas Price QC, also granted the history student bail on the condition that he stayed away from the City of Westminster where the riots took place.
But he warned Gilmour that he still faced the chance of a prison sentence over the "serious matter".
"This must not be taken as an indication that you will be dealt with in a non custodial way."
Gilmour, wearing a grey suit with a black tie, walked into court flanked by two private minders.
In Court 4 at Kingston-upon-Thames Crown Court, the slight student spoke gently only to confirm his identity and to plead guilty.
The court heard that the exact basis for the guilty plea was yet to be worked out - but Gilmour's defence barrister Mr David Spens, promised it would be ready before sentencing.
On the evening of the trouble the Royal convoy was attacked by protesters who left the cars - which included the car that took Catherine Middleton to Westminster Abbey -with broken windows and splattered with paint.
Gilmour was among the tens of thousands of demonstrators who filled Trafalgar Square and Parliament Square on a day of planned peaceful protests which descended into violence.
Gilmour issued a public apology the next day after he was captured in photographs that showed him hanging from a flag on the Cenotaph.
He said it was a "moment of idiocy".
After he was identified he expressed his "deepest apologies for the terrible insult to the thousands of people who died bravely for our country".
In a statement at the time he said: "I feel nothing but shame. My intention was not to attack or defile the Cenotaph.
"Running along with a crowd of people who had just been violently repelled by the police, I got caught up in the spirit of the moment.
"I feel additionally mortified that my moment of idiocy has distracted so much from the message (the) protest was trying to send out."
Mr Gilmour, the son of writer Polly Samson and adopted son of guitarist Gilmour, pleaded guilty at Kingston Crown Court in South London.
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