One Direction star's mum Anne Cox will marry her long-term partner Robin Twist - who has helped raise Hazza since his parents split when he was seven.
The couple are said to have picked June 1 for their nuptials to fit in with the 19-year old's busy touring schedule with 1D, with Twist's son Mike from a previous relationship joining Styles in his best man duties.
Harry's bandmates are also rumoured to be attending the ceremony, with the newspaper adding that guests were not told the final details until the last minute.
The Kiss You singer previously described Anne as his 'best friend', adding that she knows everything about his personal life: "I tell her everything, and she knows the truth".

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