The 55-year-old is on the judging panel of the hit show with Lopez, 42, and spoke about how she's getting on after her split from husband Marc Anthony.
She said: 'We've been doing auditions and she's rising above. She's strong, she's a trooper, she's a great girl. She's amazing.'
Lopez was most recently seen performing at Las Vegas's iHeartRadio Music Festival.
Speaking to the crowd, she said: 'I don't want to see anyone trying to act cool around here. I want to see you dancing and jumping and singing and acting like a fool.'