'Glee' Guest Star Darren Criss Finally Meets Katy Perry

Ever since "Glee" guest star Darren Criss warbled Katy Perry's track "Teenage Dream" on the series' November 9 episode "Never Been Kissed," he and Perry have been directing enthusiastic accolades at one another through the press. The pair finally had the first in-person meeting of their "mutual admiration society" at Sunday's American Music Awards, and Criss left singing Perry's praises once again.

"[I met Perry] very, very quickly," Criss told while walking the red carpet at Rolling Stone's post-AMA party. "It was cool. She's very sweet."

Following Criss' debut on the Fox musical series earlier this month, Perry shared her compliments via Twitter, writing, "Oh...My...Gosh... this just brought a sweet tear to my eye! Teenage Dream on GLEE makes my heart go WEEEEE!" She later told "Access Hollywood," "He's amazing! I love when any of my songs are remixed or interpreted differently. I just love that. I really welcome a creative mind to anything."

Criss was flattered by Perry's praise, telling MTV News last week the feelings were indeed mutual. "Katy makes my heart 'go weeeee,' " he said.

Criss has been quick to credit Perry and the track's other writers and producers — Dr. Luke, Ben Levin, Bonnie McKee and Max Martin — with the single's success (it reached #1 on the digital downloads chart last week, a first for a "Glee" single).

"I'm forever in [Katy's] debt, basically," Criss said. "She's been very supportive about the whole thing. She's a cool chick, and I'm a big fan."

What did you think of Criss' performance of "Teenage Dream" on "Glee"? Tell us in the comments!