Valerie Bertinelli is celebrating her body at every age. In a preview of the Friday, Dec. 13 episode of The Drew Barrymore Show, the 64-year-old star opened up about the response she received after posting a viral selfie on Instagram in just her underwear.

Asked why she posted the selfie, the Food Network alum responded, “Well, you know what, I have been coming to terms with my body now, aging, and I saw myself in the light and I went, ‘Oh I’m not mad at that.’” She then stood to lift up her sweater and reveal her stomach to the applause of host Drew Barrymore, 49.

“Like all those, you know, planks and sit-ups I’ve done, you can see underneath the saggy skin,” Bertinelli joked. “But I have to say … it’s 64 years of gravity. It’s science. If you focus in on that picture, you’re gonna see the little saggies and I’m proud of them because I’m 64. It’s a belly.”

At every stage of life and every weight, Bertinelli said she’s faced criticism about her appearance. “Why, why, why?” she asked. “And there’s so many people, ‘You’re too thin, you’re too fat, you’re out of shape. You’re in shape. Oh my God. I want those abs. Oh my God, you’re ugly.’”

She continued, “I don’t like that I was part of that manipulation of our brains of we have to look a certain way. We have to be a certain weight,” asking, “I’m a size 10. How is that too thin? I’m a size 10. How is that too fat? I’m just me. It’s my body.”

Bertinelli first posted her viral underwear selfie on Dec. 3, captioning the photo, “At some point, I will talk about the madness my body has been through this year. But right now every lump, bump, wrinkle and saggy part of me just feels acceptance and simple appreciation to be standing in front of a mirror in a hotel bathroom in downtown Manhattan ready to color my roots late on a Monday night.”