The cheeky Mortal Instruments actor, 24, shares a Harry Potter filming credit (they were both in The Deathly Hallows) with 25-year-old Grint and took delight in challenging his former co-star to shave off his ginger locks.
‘Here’s my dare for Rupert Grint – shave all of your hair off. All of it,’ the blonde London lad said.
‘Eyebrows, head… the lot! That is my dare to you Rupert Grint. If you do that, I will do the same,’ he went on, talking to Hunger magazine for the I Dare You video section of their website