Rebecca Minkoff pranked her “Real Housewives of New York City” co-stars — and Andy Cohen was “not a fan.”

The “Watch What Happens Live” host and guest Jeff Lewis blasted the fashion designer Tuesday for getting Jessel Taank, Brynn Whitfield, Jenna Lyons, Ubah Hassan and Sai De Silva to believe she was pregnant.

Minkoff, with the help of Erin Lichy, also led them to believe her husband, Gavin Bellour, was possibly not the father.

9

9

9

“I’m not a fan of a prank, I’ve got to be honest,” Cohen, 56, said on his late-night Bravo talk show, immediately addressing the scandalous storyline.

Lewis, 54, chimed in, “I think it’s a bad move. I think it’s self-producing. I think that you lose trust in your audience. I think it’s a bad move. I don’t like pranks.”

In Tuesday’s episode of the reality series, Lichy, 37, started the rumor.

9

9

“It’s very, very early on, and she’s really stressed about it,” the real estate agent told Whitfield, 38, and Lyons, 56.

Whitfield went on to spread more speculation after allegedly speaking to Bellour about Minkoff’s supposed pregnancy not being “a big deal.”

Minkoff even confronted Lichy at a group event for sharing her secret — only for the duo to gush off-camera about how “good” their acting was.

9

9

Notably, Lichy announced off-air Tuesday that she is pregnant with her and husband Abe Lichy’s fourth child.

The couple are already the parents of son Levi, 9, daughter Layla, 7, and son Elijah, 4.

Bravo viewers slammed Lichy and Minkoff via X for their trick.

9

9