Bearing in mind it concerned him going on honeymoon with his now ex-wife I would hazard a guess that the Mail have gone to their archives to have a dig at him.
An act of revenge by the Daily Mail. As Napoleon said, "I fear 4 hostile newspapers more than a thousand swords" . He must have meant the Sun, The Express, the Telegraph and the DAily Mail. The word Hysterical is more apt than Hostile.
Clearly several years ago & knowing The Mails Victorian values, he may well have kissed her in public, shocking. Fully accept more than that is not right, but its hardly news if it happened several years ago. Expect the Mail to report the Hun are causing trouble with the Empire next. Lazy vindictive journalism.