Kat Dennings felt "personally affronted" by people making "gross" comments about Billie Eilish.
The 2 Broke Girls star recently hit out at online trolls who body-shamed the 'Bad Guy' hitmaker after she was pictured in Los Angeles wearing a tank top and shorts rather than her usual baggy clothes.
Now, Kat told Entertainment Tonight: "Any woman in the spotlight is already under a tremendous amount of pressure and the internet is gross and awful and I hate it.
“I don't know if it's because she's so young and it just feels so inappropriate for anyone to comment on any young person’s body.
"People forget themselves because the internet is this wall they can hide behind... I felt personally affronted by it because she's a beautifully young girl who is making unbelievable, earth-changing art."
Kat, 34, admitted she suffered in the same way and threw her support behind the 18-year-old singer.
She added: "I mentioned in my tweet that I looked exactly like that when I was her age and I had a horrible time.
"Things have improved as far as body image for girls and boys and everybody - things are more inclusive now. But when I was growing up it was not like that.
"I hope people know that people are in their corner and that [body-shaming] is not okay.”
Here's Kat's interview on Entertainment Tonight:
Last month, Kat tweeted her support for Billie as she urged the trolls to "f*** right off".
She tweeted: "As someone who looked exactly like that at her age, it’d be nice for this unhealthy nonsense to f*** right off. She’s beautiful and normal goodbye!”
Billie herself previously endorsed the idea that "Instagram isn't real" after being criticised by body-shamers.
She took to TikTok to address the issue of body shaming, after she was mocked for wearing the casual outfit.
The award-winning musician posted a video from blogger Chizi Duru about body shaming.
The video said: "Can we normalise normal bodies? Ya'll got to start normalising real bodies, OK?
"Not everyone has a wagon behind them, OK? Guts are normal. They're normal. Boobs sag, especially after breastfeeding. Instagram isn't real."— BANG