Just how close are Real Housewives of Beverly Hills stars Yolanda Foster and Brandi Glanville? We had assumed that they're besties, but judging by new comments they're making about each other, we're not so sure.

Yolanda has seemed to have Brandi's back all season long thus far. It was especially cute to watch Yolanda help Brandi and her dad patch things up.

However, Yolanda appears on Watch What Happens Live this week, and her remarks seem to tell a different tale. 

A viewer asks Yolanda why she seems to tolerate Brandi's heavy drinking. "Oh, I can't stand it," Yolanda replies. "I hate it, yeah, and I tell her all the time. But like I always say, I'm not her mother. But I don't like it  I don't support it." 

Then, Andy Cohen asks if Yolanda and Brandi are still good friends. "We are... y'know," Yolanda trails off. "We're close when we're shooting, and you see each other every day. But you know... Yeah, we see each other." Sounds like there's some tension between these two ladies!

Clearly, Brandi did not like what she heard Yolanda say on WWHL, as Brandi tweeted while the episode aired: "@Andy @YolandaHFoster I thought we were closer, I guess... We had dinner plans Sat. until she had to cancel last sec. Hmm, I guess one never knows."

And then Yolanda fires back on Twitter, "❤Please, Think before you speak, Brandi. There is a child's privacy involved in this conversation, so back off!!!!!"

Whoa. We wonder what Yolanda means by a "child's privacy." Maybe one of her daughters had a situation, and that's why Yolanda needed to cancel her dinner with Brandi? At any rate, we love Yolanda and Brandi together, so we hope they can patch things up!

Are you surprised by the tension between Yolanda and Brandi?

Source: BravoBrandi on Twitter