PHOENIX - Fans got an unexpected surprise Saturday night during Justin Bieber's concert stop in Glendale.
The pop star fell ill while performing at Jobing.com Arena, vomiting on stage while performing his song "Out of Town Girl".
Video from inside the arena showed Bieber gamely dancing and making his way around the stage before stopping suddenly, turning his back to the audience and getting sick.
Bieber tweeted following the concert , saying, "Great show. Getting better for tomorrow's show !!!! Love u."
His next stop is Sunday night in Las Vegas.