Ashley Tisdale and Lucas Grabeel Reunite to Perform High School Musical's "What I've Been Looking For."

Ashley Tisdale reunited with fellow High School Musical star Lucas Grabeel to perform a special stripped back version of "What I've Been Looking For," and 11 years on, they sound better than ever!

"It's been 10 years since we sang this song so it was really crazy just thinking what would be the best song to sing with you and this instantly came to mind," Lucas shared in the viral video. "I started learning it on the piano and I was instantly taken aback…All of these memories came coming back."