Best man Spencer Matthews can’t stop smiling as he greets Donna Air and more star guests at brother James and Pippa Middleton’s wedding

SPENCER Matthews took his role as best man at his brother James' wedding to Pippa Middleton very seriously today, and couldn't stop smiling as he greeted guests outside.

The former Made in Chelsea star greeted Donna Air and more star guests, including Prince William and Harry and the Duchess of Cambridge, on his sibling's big day.

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Wearing a smart tux with baggy grey trousers, the star looked over the moon as he stood by the church gate.

At one point, he held his arms out to James Middleton's girlfriend Donna, who stunned in a long cream outfit and matching hat.

Spencer went solo on the day as his girlfriend Vogue Williams jetted to Dublin to give a fitness talk.

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With his hair slicked back, Spencer looked the part alongside his famous family.

He was later joined by his sister Nina, as they walked arm in arm out of church.

Meanwhile, Vogue shared a video of her working out in just a crop top and gym leggings hours before the Big Day, before announcing she'd be in Dublin.

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Performing a series of squats and press ups, Vogue showed off her flawless figure to fans.

She wrote: "Very excited to share all my fitness tips at my talk in @arnottsdublin tomorrow. There's going to be a fitness fashion show too so I can show you the best styles to wear to the gym...see you there."

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Vogue's talk, named Get Active With Vogue, will come shortly after Pippa says I Do with Spencer by his brother James' side.

Following speculation she'd been "banned" from the ceremony, Vogue's rep previously said: “Vogue has a prior engagement in her diary on the date of the wedding, but wishes Pippa and James all the best on their special day."

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Prince William and Harry were close behind, alongside the Duchess of Cambridge, who dressed in peach to support her sister.

Meanwhile Pippa stole the show and stunned in a lace white dress and full veil.

She stopped next to her father for photos outside the Berkshire church, while millionaire hedge fund manager James was all smiles as he awaited the arrival of his beautiful bride.