Lisa Vanderpump hit the dance floor last night ... literally.

During rehearsals for this week's "Dancing with the Stars," the "Real Housewives of Beverly Hills" star was seen collapsing while practicing with partner Gleb Savchekno.

The 52-year-old was seen going through some grueling rehearsals while traveling from Los Angeles to New York and back again ... and the exhaustion clearly took its toll, as she was seen blacking out completely during one of their training sessions.

Is it just us, or is it a little strange that the camera person keeps shooting ... and no producers or medics run to her aid after she fell?

On Twitter, others shared similar reactions, saying the whole thing looked "staged," "suspicious" and "hilariously dramatic." What do you think?

Lisa blogged about the scary experience with PEOPLE ahead of last night's episode -- writing "The doctor found that I had a viral infection with fever and swollen glands. And between trying to fight that and all of the stress on my body from running around, I ended up with low blood pressure and a rapid heart rate, which is why I fainted."

Despite the frightening moment, she pulled it together to perform the cha cha cha on last night's show, getting an 18/30 from the judges.

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