Beverly Hills, 90210 star Shenae Grimes has prompted whispers that she may be hiding a substance abuse problem after weeks of questionable behavior on and off of the set of the teen drama.

The 19-year-old actress was “totally wired-practically vibrating” when she hosted The Gemini Awards in her hometown of Toronto on November 28, spywitnesses tell Star Magazine.

“It’s impossble to be that high-energy without some help.”

Shenae is reportedly partying so frequently that “she’s been showing up late for filming.” She’s even forgetting her lines, says one set mole.

“People on set are complaining that she’s more trouble than she’s worth.”