Big Time Rush Surprise Guest at Selena Gomez UNICEF Concert!

Selena Gomez hosted her 2nd annual UNICEF concert on Friday night, raising over $200,000 in one night!!

Selena was joined on the stage by surprise musical group Big Time Rush, while Selena's boyfriend Justin Bieber and friends Ashley Tisdale (of High School Musical) and Ashley Benson (Pretty Little Liars) cheered her on in the audience.

Check out the video below of Selena performing "I Won't Give Up" alongside Nickelodeon's Big Time Rush.