Justin Bieber and Selena Gomez

Before Selena Gomez was officially Justin Bieber's girlfriend she was pretty scary.

At least that was the case for Bieber as he worked up the courage to plant a kiss on her lips.

Justin recently confessed he was scared before kissing Selena for the very first time.

The 18-year-old pop superstar has been dating the gorgeous 20-year-old actress for 19 months and he recalls being very nervous before their debut smooch.

Speaking about the kiss with We Love Pop magazine, he said: ''It was scary and spontaneous and it was just awesome ... It was the best (kiss) of my life.''

Despite being in a committed relationship for several months, Justin claims he still doesn't understand women.

The 'Boyfriend' singer spends a lot if his time trying to guess what Selena is thinking or what type of mood she is in.

He said: ''I don't think I'll ever stop learning about girls. You never know whether they're going to be happy or sad, do you? You kinda have to hope that they're going to be in a good mood.''

© Bang Showbi