How to use flat iron: Selena Gomez's hair mistakeLos Angeles, Aug 8 (AZINS) Singer Selena Gomez says her "biggest hair mistake" was learning to use straightening tongs when she was in the sixth grade.

"My biggest hair mistake is when I was younger and I was figuring out how to use a flat-iron.

"I used to think that just because visually I could see that this hair was straight that the back didn't necessarily have to be straight, so for the entire 6th grade I only straightened the front of my hair. That wasn't really my proudest moment," reports etonline.com.

Gomez also says her favourite hair accessory is a "scrunchie", which she likes to wear with a few strands of hair left untied.

"My favourite hair accessory is a scrunchie. I know it's kind of old school but it's really cute when you put your hair up and you let a few pieces come down. It's nice," she said.