Harry Styles 'couldn't stop smiling' as best man

His mother, Anne Cox married Robin Twist Saturday and Styles was present with his mother throughout the ceremony, reports femalefirst.co.uk. A guest said: "Harry couldn't stop smiling. He hardly left his mum's side and she looked really proud of him. He sipped champagne and talked to everyone."

Harry Styles. Pic/AFP

Styles and Twist were spotted wearing matching black lounge suits, while Cox was in an ivory, floor-length silk dress. The ceremony was held for 42 family and friends and the guests were told about it at the last minute.

An insider revealed: "They chose the medium-priced wedding package. It was a lovely day." Harry was joined by the second best man Mike, Robin's son from a previous relationship and his sister Gemma, 20, was maid of honour.