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Kaley Cuoco has never looked better!

The "Big Bang Theory" star stole the spotlight on the red carpet at the "A Night at Sardi's" benefit in Beverly Hills on Wednesday night. She flashed her rock-hard abs and bare back in sexy red cutout dress, which she paired with a black clutch, neutral eye makeup and her tousled blonde bob.

The actress posed for pictures at the star-studded soiree with ex-boyfriend Johnny Galecki, who chaired the event benefiting the Alzheimer's Association.

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Not only did Kaley create some buzz for her revealing dress, but she also made quite a statement on the stage!

She joined her "Big Bang" costars -- Galecki, Jim Parsons, Melissa Rauch, Kunal Nayyar, Simon Helberg and Mayim Bialik -- to sing some choice songs from "Grease."

Dressed in a red crop-top, fishnets and tiny black shorts, the 30-year-old beauty also reenacted the famous song from "A Chorus Line," "Dance 10 Looks 3."

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The newly-single star looks like she's in the best shape of her life, and she credits her super-fit physique to yoga.

"It took years for me to figure out what my body needs and that what works for my friends doesn’t necessarily work for me. Doing yoga five times a week has transformed my body," she recently told Shape. "I love being toned and having muscle; it’s so sexy and beautiful. And I owe it 100 percent to yoga."

"It doesn’t sound like a lot, but I lost six pounds in the last three months. That’s a whole jeans size, and we all know how good that feels! I’m the type of girl who’s always had to buy jeans in three sizes because I never know what my body is going to do from one day to the next," she added. "Everything, from the inside out, has completely changed for me. And now, when I look into the mirror and see the positive changes, I don’t want to go back to what I was doing."

Whatever she's doing, it's working!

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