PR for the brand was previously handled in-house.
Maxine Carrington, YoYo account director, said: 'Not much promotional work had been done for the brand for a while.'
She added that promotional work would include a National Kissing Day event on 6 July and 'activity' at music concerts, including the pop band S-Club 7's current tour.
The YoYo team reports to brand manager Lisa Sharratt.
The PR arm of YoYo, a group which also handles advertising and marketing, was known as Keene Communications until November last year (PRWeek, 2 November 2001).