Mirror Group Newspapers (MGN) appeals today against a High Court ruling which saw record damages paid out to eight phone-hacking victims.
In May, Mr Justice Mann awarded a total of about £1.2 million against MGN, as a result of the invasions of privacy concerned being "so serious and so prolonged".
All of the awards exceeded the previous highest sum given by a UK court in a privacy case - the £60,000 won by former Formula 1 boss Max Mosley, who successfully sued the now defunct News of the World in 2008 - and are expected to provide a framework for resolving similar civil actions in the pipeline.
Actress and businesswoman Sadie Frost received the largest sum of £260,250, with ex-England footballer Paul Gascoigne getting £188,250.
The other payments were £85,000 to TV executive Alan Yentob, £117,500 and £157,250 respectively to actresses Shobna Gulati and Lucy Taggart, and £155,000 to soap star Shane Richie.
TV producer Robert Ashworth, who was married to actress Tracy Shaw, received £201,250, and flight attendant Lauren Alcorn, who had a relationship with footballer Rio Ferdinand, was awarded £72,500.
Owner Trinity Mirror has said that MGN accepted it should pay appropriate compensation but believed that the basis used for calculating the damages was incorrect and the awards were excessive and disproportionate.
The hearing in the Court of Appeal is before Lady Justice Arden, Lady Justice Rafferty and Lord Justice Kitchin.