They were convicted of breaking Pakistan's rules on gifts after Bibi was given a luxury jewellery set by Saudi Arabia's Mohammed bin Salman during a 2021 state visit.
The pair are already serving time in prison for earlier convictions, and the new sentences - 10 years for criminal breach of trust and seven years for criminal misconduct, and a fine - will reportedly run concurrently to their earlier terms.
Khan has described the charges as politically motivated and his lawyer told BBC News his team plan to challenge the verdict.
