Una and her mates from The Saturdays are supporting this year's Poppy Appeal and helping out on a charity single to raise money for the cause.
By wearing poppies, Vanessa and her band show their support for the appeal, which is run by the charity The Royal British Legion.
The charity supports serving and former members of the Armed Forces and their families.
The single Frankie and the band have taken part in is called '2 Minute Silence' and it's not like any ordinary single... it's in the form of a silent video!
It features lots of top UK celebs, including tennis star Andy Murray and musician Mark Ronson, who all hope the unusual single will raise lots of money for the appeal.