Billie Eilish and Jesse Rutherford's Halloween costumes are not amusing.

This was how some Twitter users reacted upon seeing the musicians' costumes on Halloween where the "Bad Guy" singer dressed up as a baby while her 31-year-old rumored beau dressed up as an old man.

The pair seemed to poke fun at the criticism of their 11-year age gap, but no one is laughing.

In photos shared on social media, Eilish can be seen wearing a bright pink, flowery bonnet, baby doll-inspired makeup, and a pair of fluffy bunny slippers. Rutherford donned a bald cap replete with gray hair, a mustache, and makeup that perfectly added years to his age.

"Billie is grown enough to know how weird and creepy this is btw," one Twitter user wrote alongside photos of the two in their costumes.

Another user called out the "When The Party's Over" singer for the "insensitive" costumes and wrote, "Bro she could've gone as anything else but to go as a baby and her bf as an old man that insinuates 'ch1ld pr3d3tor' isn't dramatic for instance if someone who's white went out for Halloween as a POC wouldn't that be insensitive?"

"There's a difference between clown/zombie/vampire creepy and pedophile creepy but idk," a third one tweeted.

Meanwhile, some fans defended the singer and her boyfriend in their tweets. "Its prob a joke back at everyone talking 'ish' about the age gap," one tweeted.

"It's obviously a joke bc ppl are too in their business about their ages. On that, I don't think ppl actually know what grooming is bc meeting someone once when they're 16 then dating them at 20 isn't grooming. She's an adult and not in an otherwise vulnerable position so chill," another emphasized.

Amid the criticisms, Eilish teased another Halloween costume Tuesday.

The singer took to her Instagram stories and uploaded a photo of herself in a black outfit with fake blood on her face, neck and chest. However, some social media users thought of it as an attempt to stop people from talking about her previous problematic costume.

"girl u thought we forgot about that," one said.

"Well it can't be worse than the first," another commented.

Eilish and Rutherford were first seen holding hands at Halloween Horror nights in Los Angeles in October. Days later, the "Happier Than Ever" singer was spotted kissing her rumored boyfriend outside an Indian restaurant in California.

US singer-songwriter Billie Eilish at the 2022 Met Gala at the Metropolitan Museum of Art on May 2, 2022, in New York
US singer-songwriter Billie Eilish at the 2022 Met Gala at the Metropolitan Museum of Art on May 2, 2022, in New York AFP / ANGELA WEISS