He admitted last month to breaking lockdown rules by leaving his residence without good reason, and failing to wear a mask outside.
He also pleaded guilty to theft and criminal trespass, and was sentenced to 23 weeks in jail.
Lee’s lawyer told the court that the former part-time actor was a “late bloomer”.
A prosecutor previously told the court that Lee “would select bras and panties to steal based on their appearance”, and that he used them “for his own sexual gratification.”
Singapore authorities imposed a partial lockdown in early April, with schools and most workplaces told to close, and people only allowed to leave home for essential purposes.