Paedophile Neil Wilson, who received a suspended sentence after his 13-year-old victim was called "predatory", has been ordered to serve an immediate two-year jail sentence by Court of Appeal judges.
They ruled that his non-custodial punishment was "unduly lenient".
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.