Showbiz
Rex Features
The 25-year-old Spider-Man star reportedly met the mystery man at the Cirque Lodge rehabilitation centre in Sundance, Utah.
An insider told the magazine: "The staff has asked the two to separate more than enough. She sits on his lap while smoking cigarettes."
Dunst's new boyfriend has asked his mum to send flowers to Kirsten at the clinic on his behalf.
Dunst was reportedly prompted to go into rehab after the death of Heath Ledger.
Eva Mendes and Lindsay Lohan have also undergone treatment programmes at the Utah clinic.
> Kirsten Dunst denies breakdown rumours
More: Kirsten Dunst, Showbiz
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