Actress Kaley Cuoco was caught snapping her bare breasts on Snapchat, with a heart emoji cover it up. Photo / Getty Images

Kaley Cuoco knows how to spark a Big Bang.

The 30-year-old stunned fans by flashing her bare breast in a Snapchat photo with friend and celebrity stylist Brad Goreski.

The Big Bang Theory actress pulled open her pink dressing gown to free the nipple for the cheeky snap.

But 39-year-old Goreski, who posted the photo, used a red heart emoji to protect his flashy friend's modesty.

Cuoco, whose divorce from Ryan Sweeting was finalised in May, has found love again with professional horse rider Karl Cook, 26.

"It's funny, he's either the one riding or it's me, so we're rarely doing it together," she told People magazine about her new man.

"But recently we did go on a little trail ride date. It was adorable. We hadn't really done that yet. One is usually cheering for the other so that was kind of cute to go out together. We totally held hands. It was very dorky!"

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She said she has learnt a lot about love in the past year.

"When you share something so special, some sort of connection - for us, it's horses, but anything two people share - you have that common goal and you know that you want the same things in life, day to day, and in the future," she said.

"It just sets you on a better path. Having a lot in common is really important and we definitely have a lot in common. I think that that's what makes us so strong and really happy."

According to Forbes, Cook's dad is a businessman with an estimated wealth of $2.6 billion.

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