First, she shed her partner of 23 years, Geoff Knight, 55, last summer... that's 15 stone.
Then the 54-year-old East-Enders and Bill star slimmed down by a stone to 8st 7lb.
She told Closer magazine: "You could say it's my new life diet."
The mum of two said of the split: "I felt I wasn't living life to the full, I wasn't being myself and, as scary as it was, I knew it was time to move on."
Closer is on sale tomorrow.
HEEL DEAL Gillian is no wall flower BACK IN BLACK Actress looks slim and trim SHOOT Closer mag