By Sandra Rose  | 

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Lizzo fans are outraged over a simple case of mistaken identity.

The incident happened during a segment called "Will! Kathy! Know Them?" on an episode of "Watch What Happens Live."

The Real Housewives of Beverly Hills star Kathy Hilton mistakenly identified singer Lizzo (above right) as the character "Precious" portrayed by actress Gabourey Sidibe in the movie Precious.

Crystal Kung Minkoff, Hilton's co-star on RHOBH, tried to help her out by saying, "She is precious though, Lizzo is precious."

Hilton quickly agreed, saying, "That's what I call her! Her nickname's 'Precious' to me."

Host Andy Cohen hid his face with the question cards, and appeared horrified by Hilton's mistake. He quickly moved on to the next question.

Nicky Nelson/WENN.com

Both Gabby (L) and Lizzo (R) are obese Black women, but the similarities end there.

Fans took to Twitter to blast Hilton for giving credence to the stereotype that all Black people look alike.

One Twitter user wrote: "There's nothing funny about Kathy Hilton calling Lizzo 'Precious.' Absolutely nothing."

Another user wrote: "Kathy Hilton damn well know Lizzo ain't Precious, a FICTIONAL character. That's mad disrespectful, racist, and fatphobic."