Along with bandmate Vanessa White (pregnant Frankie has been told by doctors that she can't perform until after her baby is born), the girls took to the stage at both two-day events in Essex and Staffordshire.
They also found time to kick back and relax in the exclusive Virgin Media Louder Lounge and, at one point, Mollie, Rochelle and Una posed for this stunning snap together.
In the picture, the girls are huddled together as the sun beamed down and they are looking extremely happy and content.
Reflecting on their time at the festival, which saw them perform for thousands of fans on the main stage, Mollie shared it with her Twitter followers this afternoon (21 August).
The blonde singer said: "Cute! 3/5 Sats."
Mollie has been inundated with comments since posting the picture, with many fans quite rightly describing the girls as "beautiful".
One male follower even joked: "All beautiful. Dinner sometime, Mollie?"
Check out all the best pictures from this year's Virgin Media V Festival in our gallery below!
Copyright: Rex Features AKEM