Seyfried, 26, who called time on her romance with 33-year-old Hartnett earlier this month, was seen being dropped off at a gym by former boyfriend Cooper, prompting rumours of yet another reconciliation for the on-off couple, reported Daily Mail online.
The pair first got together in 2008 after falling in love on the sets of "Mamma Mia". But they split in 2010 when it was revealed that Cooper had become romantically involved with his stage co-star, Ethiopian-born actress Ruth Negga.
Last summer Cooper and Seyfried had a rapprochement but he then started dating Ruth again. But he is apparently no longer seeing her.
"It is hard to keep up with Dominic