A woman has gone viral after capturing the moment her "diva" cat realized she was no longer the only pet in the house.

Lisa Ringnalda recently made the decision to get a kitten, but she seemingly didn't include her 7-year-old cat in the discussion.

A video showing the moment her older cat saw the kitten for the first time has gone viral, highlighting the look of horror on the older cat's face.

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In a clip shared to her TikTok account @lisaringnalda on August 4, a fluffy white kitten sits, relaxing, on Ringnalda's lap, when the older cat walks into the room and realizes what she's looking at.

Newsweek has contacted @lisaringnalda for comment via TikTok.

Ringnalda zooms in on the Norwegian forest cat's face, which stares, unblinking.

Mimi, the new kitten, doesn't appear to notice anything wrong and continues relaxing on Ringnalda's lap.

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Their owner wrote in the video's overlaid text, "POV: Your 7 year old (diva) cat sees the new kitten for the first time."

Ringnalda assured commenters that, despite the initial horror, the two cats were becoming "besties."

TikTok users were in bits over the clip, which has racked up more than 29,000 likes, with one commenter writing, "The look is giving 'How very DARE you!'"

"That's definitely a 'what the fluff is that' look," another added, while one user wrote, "The betrayal."

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Another commenter, referencing the hot pink harness the older cat wore in the video, wrote, "Ready with clothes on, moving out."

Getting a cat used to a new kitten can take time. Purina, a pet food company, advised getting the older cat used to the scent of the new arrival before they enter the home, such as by introducing their bedding and offering the cat treats, to get them to associate the new scent with a positive experience.

The owner should consider keeping the two pets apart for the first few days, allowing them to get used to each other's scents while still maintaining their own territory. When they're both ready, make small introductions, and expect to see hissing or puffing up as they get used to each other.

While the introduction may be rocky, the cats should get used to each other and even learn to enjoy each other's company.

Ringnalda has shared another video showing the two cats getting used to each other. In it, the kitten tries to play with the older pet, and the Norwegian forest cat, though still wary, begins to respond.

Do you have funny and adorable videos or pictures of your pet you want to share? Send them to life@newsweek.com with some details about your best friend and they could appear in our Pet of the Week lineup.