The One Direction singer sipped champagne, tasted cake and looked sharp in his black suit

Harry Styles Serves as Best Man at His Mother's Wedding

He’s the best man and a proud son.

Harry Styles had a very important gig – walking the bride down the aisle – at his mother’s wedding this weekend in the town of Congleton in Cheshire, England.

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Anne Cox, dressed in a white floor-length gown with a lace top, married longtime partner Robin Twist, who helped raise the One Direction singer, at Pecks restaurant on Saturday, according to a local report.

Styles, 19, wore a black suit with a white shirt, a skinny black tie and a white rose on his lapel to match the bouquet his mother carried at the ceremony, which was a relatively low key affair considering it was attended by one of the world’s biggest pop stars.

“Harry couldn’t stop smiling. He hardly left his mum’s side and she looked really proud of him. He sipped champagne and chatted to everyone,” a guest told the Sunday Mirror.

Inside guests were smiling and having fun, which Styles recorded on his official Vine account. In the six-second video, Styles, the bride, groom and wedding guests are tasting cake and drinking champagne.