Blackthorne also re-posted Cuoco's pic on his own Instagram, offering a chance for those buying the T-shirt to win one signed by Cuoco.
So what do we know about Cuoco's possible new man? Blackthorne is a British actor as well as an accomplished photographer, and has had roles on ER, 24, and Lipstick Jungle. He currently plays Detective Quentin Lance on Arrow. A source tells ET he was engaged a couple years ago, to a woman who is not a celebrity. He also dated Daryl Hannah in 2010.
Cuoco and Blackthorne also share the same agent, and aside from their television background, have a common passion for animals. Blackthorne's Instagram is filled with posts on his conservation efforts, including this pic of him sporting his own face on a T-shirt, reading, "Poach eggs, not elephants."
"I ride horses five days a week whenever I can," she told Shape in September. "I have six horses, and they have been the biggest blessing in my life. Horseback riding is why I'm so centered, especially in this business. I wouldn't have my career without it."
Whether Cuoco's in a new relationship or not, it's safe to say she's looking better than ever. Watch the video below to see her flaunting her killer abs in nothing but a Calvin Klein bra top while promoting her upcoming appearance on Lip Sync Battle!