Hell hath no fury like a jealous Belieber -- and that's a lesson Nickelodeon star Ariana Grande learned the hard way after tweeting a cute photo of Justin Bieber kissing her. But lest anyone get the wrong idea, don't worry. It's kind of a family affair.

Justin replied with a message for grandma:

After Ariana's followers were all "details, please," she followed up with a photo (slight aside but come on, kid, at least take your shades off for the seniors):

And Justin responded thusly:

Ariana then unwittingly painted a target on her forehead by posting this pic of Justin smooching her on the cheek:

The backlash was apparently so fierce that she later deleted the tweet and scolded the angry mob:

Stand down, Beliebers. In case you didn't know, Ariana's been dating Australian actor Jai Brooks (from the YouTube comedy group The Janoskians) for nearly a year. And judging by the adorable stuff he posted about her on Instagram earlier this week, they're still going strong.

Ariana Grande Boyfriend