The US musician faced an allegation he attacked a former friend at the Tape club in Mayfair in 2023.
At Southwark Crown Court on Friday, the R&B singer admitted an additional charge of affray.
The 37-year-old denied charges of grievous bodily harm and actual bodily harm against Abraham Diaw. Prosecutors have now dropped the assault charges.
Brown will be sentenced on 26 October for the affray charge.
He arrived at court wearing a tan suit, gold-rimmed sunglasses, a St Louis Cardinals baseball hat and flanked by security guards.
Brown’s bail conditions allowed him to go on a world tour as long as he surrendered his passport on arrival in each country, and he was ordered to pay a £5 million security fee.
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