It's the trial Prince Harry — and the rest of the world — has been anticipating for a long time now.
The prince and 100 others are suing MGN, the publisher of the Daily Mirror, Sunday Mirror and Sunday People, over allegations of phone-hacking and unlawful information-gathering between 1991 and 2011.
Those suing claim senior editors and executives at MGN knew about and approved of the wrongdoing.
Harry had been selected as one of four test cases leading to him becoming the first senior royal to appear in a witness box for more than 130 years.
Watch: 4 revelations from Prince Harry's memoir. Post continues below.
Interestingly, MGN has previously admitted its titles were involved in phone-hacking — the illegal interception of mobile voicemails — settling more than 600 claims.
But they say there was no mobile phone data nor any shred of evidence to show Harry was a victim.
Given it's the trial everyone is talking about, here are the five biggest takeaways from the court case (so far).