The overnight formula is packed with antioxidants that aim to replenish, smooth and firm your skin.

Sure, celebrities have access to expensive treatments and elite touch-ups that we, mere mortals, don't. But there are certain products that are totally accessible -- at the drugstore, or one click away at Amazon -- that the most radiant Hollywood luminaries swear by. One such product? L'Oréal Paris Age-Perfect Midnight Serum, which ageless icon Jane Fonda uses as part of her nightly routine.

But wait, it gets better. Right now you can get this serum at a 45% discount at Amazon -- down from its usual price of $44 to just $24.

Can we say it any more plainly? L'Oréal's serum is 45% off right now. For $24, you're scoring a celeb favorite at a mega-discount.

Aside from the super-sweet sale price, there's a whole lot to love about the serum. Here's what Fonda, a L'Oreal brand ambassador, said when chatting with Grazia Daily: "At night, after I've removed my makeup, I use L'Oréal Paris' Midnight Serum. It has a lot of antioxidants and good things to hydrate the skin and comes in recyclable glass. They're trying to use less plastic, be more sustainable and are recycling products, so I think that's a good thing." Fonda isn't the only celeb who loves the Midnight Serum -- L'Oréal brand ambassador Kate Winslet has also extolled its qualities, saying that it "makes everything dewy and delicious the next morning."

How does it work? The serum's patented vitamin E blend helps replenish antioxidant levels overnight, when the skin is most receptive,. It aims to smooth, firm and boost radiance without clogging pores or leaving a sticky residue.

Over 1,200 Amazon reviewers have given this serum a glowing rating, with many five-star fans raving about its anti-aging properties.

"It really works," marveled one Amazon shopper. "In the small amount of time I have been using this product, I have already seen a marked change in my face. I bought this to improve wrinkles and texture, and I am not disappointed in the results."

"Holy grail status," gushed this reviewer. A similarly thrilled mega-fan chimed in: "Have tried many others and this serum works magic on my skin!"

Another fan reported, "If you have old tired-looking skin, get this product! This is one of the very best skin care products I've ever used!!! And it's affordable. It will brighten up your skin tone and close your pores. In two weeks you really will have younger-looking skin. It's like a little miracle in a bottle."

There is room for improvement with the bottle, according to some fans. "My only complaint is the bottle doesn't let you see inside," cautioned an otherwise pleased shopper. "I didn't know the first bottle was almost empty until it was empty."

Another noted: "This product is well-priced, effective, but the dropper needs work. When you get to the bottom, it becomes difficult to get out the recommended three drops. Other than that, it is superb."

Looking for other beauty products that celebs love? Martha Stewart has been using this mist for years.