Kaley Cuoco

Steve Granitz/WireImage

Physics can be a blast, but you can't beat chemistry.

The Big Bang Theory's Kaley Cuoco is engaged to boyfriend Josh "Lazie" Resnik, her publicist confirmed Tuesday to E! News.

We hope her ex-fiancé isn't too jealous...

"I'd like you to know who I'm engaged to—Chopard, the jewelry designer," Cuoco joked on the red carpet at the Golden Globes in January, where she flashed a borrowed piece of bling on her finger.

Maybe the big ring theory was bogus at the time, but now...

Cuoco's rep confirms that the actress and Resnik, an addiction specialist, are planning to tie the knot but have not set a date yet.

And while Chopard will just have to grin and bear it, we hope Cuoco's happy news doesn't cause any hard feelings on the Big Bang Theory set. She revealed in September 2010 that she and costar Johnny Galecki quietly dated for two years before the relationship ran its course.

"We were so protective of ourselves and the show and didn't want anything to ruin that. But that also made it sad, too," Cuoco said. "That's not the kind of relationship I want—I don't want to be hiding."

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