Ryan Cabrera is singing his praises for ex-girlfriend Ashlee Simpson !

If you forgot, Ryan , 43, and Ashlee , 41, dated back in 2004 and their romance was documented in MTV’s The Ashlee Simpson Show .

In a new interview, Ryan reacted to Ashlee ‘s new music chapter and her Las Vegas residency .

“Everybody’s excited for that. I mean, all of my friends are hitting me up going, ‘Hey, I was gonna go to Vegas. Do you think we can go see Ashlee?’ I’m like, ‘Dude, I would love to see that show.’ Even my wife,” Ryan told Us Weekly . “I messaged [her mom] Tina when I saw that was going on, and it made me say, ‘Oh my God, I want to revisit those albums.’”

Now over two decades after their romance, Ryan still has a lot of respect and admiration for Ashlee .

“Ashlee was

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