The agencies were appointed after a pitch process for the business, which was previously handled in-house.
Big Al's will be responsible for work that will be used both in the UK and internationally, with a combined spend of £4 million, while the7stars will work on the £2 million UK planning and buying account.
The review was held to co-incide with a relaunch of the brand, which includes new packaging, brand collateral, a revamped ecommerce site and the roll-out of new products in the Yardley portfolio.
Advertising spend will be focused on national press and weekend supplements.
Quentin Higham, the Yardley managing director, said: "We are delighted to be working with Big Al's and the7stars, who impressed us with an outstanding piece of creative and an exciting media plan."
This article was first published on campaignlive.co.uk