Watch Real Housewives of Beverly Hills reunion online: Kyle and Kim Richards fight, Lisa Vanderpump disgusted by Brandi?

Real Housewives of Beverly Hills season five reunion airs tonight, 31 March at 9pm on Bravo.

Click here to watch the episode online on the Bravo website.

A new sneak-peek shows heated insults between Brandi Glanville and Lisa Vanderpump when host Andy Cohen starts asking questions about Brandi's hookup with Lisa's son's best friend during their Amsterdam trip.

"You have said the rudest things to me since you arrived about Andre," Brandi says in the promo.

"Which was Max's best friend. He's 22. Come on," Lisa replied. "To me it's disgusting."

Lisa explained that she has known Andre since he and her adopted son Max were seven years old, which is why the thought of Brandi hooking up with him is so distasteful, but Brandi claims that she isn't ashamed of her trip to cougar town.

"Well guess what I f**ked him and it was great," Brandi states.

"You know what he said to me? He said, 'Oh no Lisa I didn't have sex with her because she was too drunk.' That's what he said to me outside," Lisa explained.

"No he didn't," Glanville replied. "He spent two nights with me. We had sex both nights."

"That is what he said to me," Lisa said.

"It's mean to say that or make it up," Brandi replied.

"I don't make things up. That's what he said to me outside," Lisa said.

"I'm just saying she's calling me mean and all she's done since we've arrived is be mean," Brandi said. "I think you're just pissed that he didn't wanna f**k you."

Peace between Kyle and Kim Richards seems unlikely, as reports suggest that the sisters' fight will get ugly in the reunion episode.

According to E! Online, the reunion episode is the first time the sisters talk to each other after several months. In the promo teaser, Kim admits the need to settle her differences with Kyle, as long as it is done without cameras and with a professional therapist. However, she says that she is already content with how things are.

Meanwhile, Andy Cohen, revealed that the Beverly Hills reunion is uglier than the Season 7 The Real Housewives of Atlanta reunion show.

The host answered some viewer questions via Twitter and replied to a fan's query asking if this reunion is better than RHOA, to which Andy replied that the Beverly Hills one is "more ratchet."

@ShanaJones5 BH is more ratchet!

— Andy Cohen (@Andy) March 31, 2015