The former couple are going through a bitter divorce and Gruffudd, 48, has now moved on in a new relationship with Australian actor Bianca Wallace.
Evans has spoken publicly about the heartbreak of seeing them together, and has now said that Wallace was mocking her in an Instagram selfie which showed her with lipstick and eyeshadow smudged across her face.
In a now-deleted Instagram post, Evans, 53, shared the photo of 30-year-old Wallace and wrote: "This is my husband’s girlfriend trying to take the p*** out of me when I had been hit by a rock so large I never thought I’d come through. And because I can’t see, I sometimes don’t get my make-up right.
"I know this happens. I didn’t feel you noticed. But now I know so maybe I’m too old to be posting pics like that, eh. Thanks for the warning.
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"I hope you have a great life laughing at people you think are not as cool as you and don’t worry - I am giving up my entire career to make sure our kids grow up balanced, thoughtful, creative, and courageous.
"Good luck to both of you in your endeavours."
Gruffudd revealed he was dating Wallace months after splitting from his wife, although Evans has accused them of having an affair for years previously - something Gruffudd and Wallace have both denied.
Evans shares two daughters with Gruffudd and has been open about the impact that the split has had on herself and her children.
The Bristol-born actor recently revealed that she had had to let her divorce lawyers go as she could not afford them any more, saying that she was struggling to pay her bills and buy food.
Watch: Alice Evans on the collapse of her marriage to Ioan Gruffudd