Justin Bieber has opened up on the quality he finds sexiest in a woman.

The singer, who previously dated Selena Gomez, told Cosmopolitan that he thinks "attitude" is the hottest thing about a girl.

In the same interview, the 21-year-old spoke about some things his fans probably won't know about him.

Bieber said: "I can hold my breath underwater for two minutes."

He added that he is "secretly terrified" of spiders.

The singer also said that he likes when girls wear "booty shorts".

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Watch Justin Bieber in action below: