The band were the first to take to the stage today, and will be followed later by the likes of Ellie Goulding and Mumford and Sons.
Here are 11 pictures from the set taken by Chris Moorhouse:
5. Courting Victorious 2023
Lead singer Sean Murphy-O'Neill got the crowd going at Victorious
Picture: Chris Moorhouse (jpns 270823-027) Photo: Chris Moorhouse
6. Courting Victorious 2023
Sean Murphy-O'Neill sings for the crowds to kick off proceedings on the Common Stage Picture: Chris Moorhouse (jpns 270823-025) Photo: Chris Moorhouse
7. Courting Victorious 2023
In the crowd for Courting
Picture: Chris Moorhouse (jpns 270823-021) Photo: Chris Moorhouse
8. Courting Victorious 2023
Courting. Sunday morning at Victorious, Southsea Common Picture: Chris Moorhouse (jpns 270823-020) Photo: Chris Moorhouse