The online campaign, which launches on 1 August, will feature Donovan and Alan singing "a heartfelt love song".
The drive continues the theme of the brand's latest TV ads, first aired in May, which centre on giving British men a voice, according to Wall's. The online content can be personalised by users and sent on to their friends.
The campaign is part of Kerry Foods’ digital marketing push. Its Wall's ads, featuring Alan, have attracted almost on emillion YouTube views, while the character also has a Twitter feed.
Phil Chapman, chief marketing officer at Kerry Foods, said: "Jason seemed like the perfect fit in this fun, tongue-in-cheek spoof."