09/30/2012 at 02:05 PM EDT
For Justin Bieber
, the show must always go on.
After throwing up on stage during his Believe
tour Saturday night, the pop star seems to be taking it easy before he takes the stage in Las Vegas.
"Getting better for tomorrow's show!" Tweeted Bieber
, 18, following his Glendale, Ariz., concert, in which he soldiered through a 21-song set despite a seemingly upset stomach.
His turn at the Jobing.com Arena came to the encouragement of his fans, who showed their support for their idol after he became ill mid-show and left the stage twice.
"It's hard for me, you know, not feeling great and throwing up in front of a bunch of people," he told the crowd after leaving the stage during his song "Beauty and a Beat," according to the USA Today
. "Will you love me even though I'm throwing up on stage?"
To the hoot and hollers from his ever-vocal audience, he continued, "Okay, I wanted to give you my best show ever, so do you mind if I finish it?"
As for the cause of his illness, Bieber had a sense of humor. "Milk was a bad choice," he wrote
in a nod to the 2004 comedy Anchorman