09/27/2011 AT 08:00 PM EDT
is back to work
on American Idol
– and she's not letting personal drama get in the way.
"We've been doing auditions and she's rising above," Lopez's fellow judge Randy Jackson, 55, told PEOPLE Saturday at Las Vegas's iHeartRadio Music Festival, where both he and Lopez performed. "She's strong, she's a trouper, she's a great girl. She's amazing."
Since announcing her split
with husband Marc Anthony, Lopez appears to be in good spirits
, even recently joining Anthony
poolside at Miami.
On Saturday, though, Lopez, 42, did what she does best: performing. During her 25-minute set, Lopez seemed energetic, jumping around the stage with her dancers and singing a medley of her hits.
"I don't want to see anyone trying to act cool around here," she told the crowd. "I want to see you dancing and jumping and singing and acting like a fool."
It certainly seems as though Lopez, who let loose
later that night at Pure nightclub, is, indeed, enjoying the single life. But if she ever needs anything, Jackson said the Idol
family always has her back.
"Whatever help we need to give, we'll give her," he said.