Maisie Smith could reportedly lose her job on EastEnders following a number of incidents away from work.
The 19-year-old, who has played the role of Tiffany Butcher since she was a child, was photographed smoking cannabis in her car several weeks ago.
Smith has also allegedly gone against the BBC's wishes by signing a deal to promote brands on TikTok, where she has amassed an impressive 1.7 million followers.
"EastEnders do not take matters like this lightly," a source told The Sun. "There's no blanket rule on deals, and they take each case on its own merit.
"But if they're asked if it's OK and the star is told 'No', they take a very dim view about it then happening.
"Paired up with the incident a few weeks ago, it doesn't look good. She will be spoken to in no uncertain terms and told it will not happen again."
A spokeswoman confirmed to the newspaper that the soap is "looking into this matter".