Justin Bieber & Selena Gomez: Birthday Kiss!

Justin Bieber plants a kiss on girlfriend Selena Gomez‘s cheek at his birthday party on Friday (March 2) in Los Angeles.

The birthday boy – who turned 18 on March 1 – and Selena, 19, partied the night away with friends and their mutual agent, Nick Styne.

PHOTOS: Check out the latest pics of Selena Gomez

“Happy birthday to my best friend in the world world!!! Have a great birthday baby!” Selena tweeted to Justin on his birthday.

Also pictured inside: Selena catching a flight out of Florida, where she is currently filming Spring Breakers, to make it to Justin‘s party.

Posted To:Justin Bieber Selena Gomez