The 24-year-old singer joined band mates Frankie Sandford, Una Healy, Mollie King, Vanessa White and Prince Charles for the opening of a new Marie Curie Hospice in West Midlands, Solihull today.
Rochelle, who gave birth to daughter Alaia-Mai on 20 May, only returned from maternity leave this week, and today's visit to Solihull marked the first time she's been pictured with the group since March.
"It is such an honour to be part of such a special day and amazing to see how fantastic the hospice looks and we are all very proud to be ambassadors for Marie Curie," she said.
She later added on Twitter: "Today I met Prince Charles....just another day at the office..."
Frankie, meanwhile, who will be the next Saturday to become a mother, showed off her blooming baby bump in a pretty cobalt blue dress in pictures posted to Marie Curie's official Twitter.
The new Marie Curie unit provides free expert care for people with terminal illnesses, and will care for more than 2,000 people each year. The Saturdays have been long-time supporters of the £20 million project and were on hand when the first bricks were laid two years ago.
A tweet from the band's official Twitter account said: "What a brilliant and inspiring morning. So much respect to @mariecurieuk and their nurses."
The Saturdays and the Prince of Wales met with patients and staff during their visit and toured the facilities. Prince Charles also gave a speech and unveiled an official plaque to celebrate the opening.
Marie Curie's chief exec Jane Collins said: "We are honoured that His Royal Highness, The Prince of Wales and The Saturdays were able to attend today and open our new hospice and meet our staff, volunteers and patients. We are grateful to everyone who has been involved in raising the funds to build this fantastic new hospice which will allow us to care for more patients across the West Midlands."