Harry Hamlin has been quite the hot topic on The Real Housewives of Beverly Hills as of late.

In fact, just the mention of him brought his wife, Lisa Rinna, to her feet so that she could toss water on Kim Richards.

Kim Richards kept bringing up Harry Hamlin as though she knows a big secret about him.

That was too much for Lisa, who then broke the glass on the table.

Kim Richards didn’t come out and say just what Harry Hamlin’s big secret was that she knew, but it sure seemed to push Lisa Rinna’s buttons.

This is all that matters. This is my life, my everything.

A photo posted by Lisa Rinna (@lisarinna) on Mar 2, 2015 at 8:04am PST

It could have something to do with Harry Hamlin’s struggle with alcohol addiction.

Lisa Rinna opened up about Harry Hamlin’s struggle on Tuesday’s episode to her co-star Yolanda Foster.

“Harry’s been sober, um, three years,” Rinna revealed.

“After two brothers dying, that’s probably when he said, ‘No more,'” said Foster. Lisa Rinna had revealed that Harry Hamlin lost two brothers to alcoholism six months apart.

“I think it just woke him up, and in his mind he said, ‘You know what? I have to stop this,’ because, you know, it goes back hundreds of years,” said Lisa.

“It’s a true illness, you know?” Foster responded.

Or it could have something to do with Harry Hamlin’s initial distaste for the show.

Lisa Rinna said on Live! With Kelly and Michael that when she first approached Harry Hamlin, her husband of 18 years, about doing RHOBH, he was not on board.

https://www.youtube.com/watch?v=spXVq0xn4gk

“I went to Harry and said I’m thinking about [doing RHOBH] and he looked at me and said, ‘If you do this show, I’ll divorce you.'”

After Harry Hamlin’s response, she was not going to push it.

“I walked away and was done with it,” Rinna told host Kelly Ripa. “Actually, I was done with the show idea.”

However, after Harry Hamlin slept on it, he decided it wasn’t such a bad idea after all.

She continued, “He comes to me a day later and he goes – and you’ve met him, he’s very mellow, very low-key – and he said, ‘I’ve thought about this and I think it’ll be a good idea if you did it.’ He went through it. And I was like ‘OK.’ And there you are!”

Harry Hamlin’s secret could also be something totally different.

Or Kim Richards could just totally be making something up to get the heat off of herself and her sobriety.

What do you think it could be?