The 51-year-old actress took to Instagram on Tuesday to share a makeup-free selfie as part of the "Wake Up Call" challenge.
"I woke up like this" #UNICEF #WakeUpCall," she captioned her fresh-faced photo.
Rinna is just one of a series of celebs, including Cindy Crawford, Naomi Campbell, Anna Kendrick and Elle MacPherson, who has posted a photo first thing in the morning with the intention of drawing attention (and raising money) for Syria through Unicef.
We have to admit -- all of these ladies look good without makeup!
So, how does Lisa maintain that youthful glow? "I'm mostly a vegan, and I try to avoid gluten," she recently told toofab. "I say 'mostly' because I slip every once in a while. Dairy was the hardest thing to go off, but my skin cleared up immediately after I stopped eating it."
The brunette bombshell also loves to work out, revealing that it's "all about consistency."
"I have been very active since I was 16, when I started doing Jazzercise," she explained. "I found Jazzercise and I thought I found Jesus! I workout because it makes me feel good. I get cranky when I'm not active."
All that hard work has paid off!
Click "Launch Gallery" below to see more of your favorite ladies of women of the 90's, and check out the photos above to see more stars without makeup.