Singh, who pleaded not guilty, received the maximum fine of S$7,000 for each charge following a 13-day trial.
The 49-year-old appealed against the conviction before Justice Steven Chong last month.
On Thursday morning, Singh arrived at the Supreme Court for the verdict.
During parliamentary committee hearings in December 2021, Singh testified he had urged Khan to clarify her falsehood on August 8 that year and, in a subsequent conversation on October 3, stressed the need for her to address the lie if it arose in parliament the following day.
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