The 18-year-old Wizards of Waverly Place actress doesn't approve of Justin's vow to not shave for a month so he can grow a moustache.
During an appearance on US radio show Morning Mash Up on SiriusXM today, Gomez told listeners that she didn't encourage Justin's hair - and she didn't mind telling him.
She said: 'You've gotta commit. You can't just be like, 'All right, let me just do a little one'.'
Though Selena did go on to explain that she's not totally against facial hair, before adding that she hates 'soul patches' and she's not sure Justin's moustache will reach its full potential in four weeks.
She joked: 'He needs a little more time.'