The new commercial, which hit screens this week, aims to build on the success of the Tummy Loving Care campaign launched last December.
Following the same theme, the ad kicks off in Battersea Park in London with the former Eastenders actress declaring "You may think you know all about it", before panning to a shot of people who eat Activia every day.
The ad concludes with McCutcheon and her friends enjoying the yoghurts and urging viewers to "make this the summer of TLC".
McCutcheon's previous ad helped fuel year-on-year sales growth of 14.8% [Nielsen MAT 19 June 2010], according to Danone.
The ads will help to promote the seven ranges and 20 flavours in Activia's portfolio.