The happy couple visited Blenheim Palace, the place they tied the knot in a fairytale ceremony on 27 July 2012.
Marvin and Rochelle, who became proud parents to Alaia-Mai in May, were the picture of happiness as they posed for photos in the sumptuous palace gardens.
DJ and musician Marvin, 28, sent a heart-warming tweet. "1 year ago today..1 of the happiest days of my life..I married the most incredible woman in the world..Happy Anniversary baby..I Love You x"
Saturdays star Rochelle replied to her other half, writing, "Can't believe how much has happened in a year. The best day ever. Love you lots. Excited for today xx"
New mum Rochelle showed off her gorgeous post-pregnancy figure in vibrant red chinos and a black embellished top. Marvin was casual in a navy blue t-shirt and jeans. Both wore wide smiles as they toasted their first year of marriage with a glass of Pimms.
Marvin later posted the snapshots on Twitter accompanied by the caption, "Happy Anniversary...this is where it all happened!"
Marvin's JLS band mate Aston Merrygold tweeted his congratulations, "What a day to remember and it's been a year already! my brother and sister celebrated their first year in the most amazing way by bringing Lil mai into the world!! Hope you all have a great day love to u both always!"
Band mate JB Gill also sent his best wishes to the pair."Happy Anniversary @MarvinHumes and @RochelleTheSats," he wrote. "May God continue to bless your relationship, family and marriage for many years to come! x"
Marvin and Rochelle said 'I do' at the Oxfordshire stately home last summer and HELLO! was invited to capture every magical moment of their special day.
Months of secret planning had gone into ensuring all the intricate details of the celebrations remained a surprise for all but the closest of the 250 family members and friends who joined the couple during the day and the further 150 glamorous guests who arrived for the fun-packed evening festivities.
Among the famous faces to attend the stylish black-tie wedding were singers Olly Murs, Pixie Lott, Alexandra Burke and Diana Vickers, Harry Styles, Liam Payne and Niall Horan of boyband One Direction and DJ Reggie Yates.
The gorgeous bride and groom – who got engaged on New Year's Eve while in the Maldives, where Marvin presented Rochelle with a heart-shaped diamond ring – were adamant that their nuptials should reflect their personalities.
"One of the things I love most about Marvin is that he is so traditional, because so am I," Rochelle told HELLO! on the morning of the wedding.
Rochelle told HELLO! that the moment Marvin popped the question, she knew there was only one place she would be heading to buy her wedding dress.
"It had to be Vera Wang. Marvin proposed two days into a ten-day holiday and I was itching to get back so I could go and find my dress. To me, Vera Wang's designs are the ultimate. I knew I'd find my dream dress in her collection and I did."
Speaking of her bridesmaids, who included her fellow The Saturdays band members Una Healy, Mollie King, Frankie Sandford and Vanessa White, Rochelle revealed, "I feel so close to these girls. We've been on such a high – I'm so lucky to have them in my life."
Read the latest from HELLO! Online's celebrity blogger Una Healy