Tween sensations Selena Gomez and Justin Bieber took a weekend to celebrate the actress-turned-singer's 19th birthday.

The duo began the festivities with a day of light-hearted fun at Disneyland in Aneheim, California.

Selena, a Disney Channel star, was spotted happily browsing the shops with her guy. 

Justin then treated the birthday girl to dinner at the high-end Geisha House restaurant in Hollywood.

The Baby singer finished off the weekend with a surprise appearance at Selena's Sunday night concert - much to the audience's delight.

Of the surprise appearance he tweeted: "Had a great night and suprised the people. Felt good to be on stage. Nothing is changing that."

He posted a picture of himself giving his Wizards of Waverley Place girlfiend a kiss on the cheek with the caption: "Happy bday baby".