The 62-year-old Aerosmith frontman said he's been impressed with Lopez's judging skills on the show.
He said to UsMagazine.com: 'First and foremost, she's a lady and she's not afraid to show that at any given time.'
He added: 'She's ridiculous. You know, she's exactly what I thought she'd be. She's street.'
Tyler admitted he finds Lopez's honesty with the contestants 'incredible' and said it's difficult to be a judge at times.
He said: 'It's hard when you have a kid who's 15-years-old, who's been watching American Idol for the last 10 years. And some of them were awful, I just say something like: 'Did you bump your head on the way in?''