Superstar Katy Perry may have gone through a tough personal time over the past year, but her career is flourishing and she has managed to reach out to a broad fan base with her honesty and talent.

Her debut concert movie 'Part Of Me 3D' has also been well received and saw one unexpected famous fan in particular praise the full-length feature for being "so well done".

Hollywood veteran and fitness guru Jane Fonda (pictured left) took to her official blog earlier today (July 16) to tell her readers that she admires the 'Teenage Dream' beauty in many ways and had nothing but respect for her sincere film:

"Invited friends to go with me to Katy Perry's Part of Me. I am a fan but my friends didn't know her and never would have gone had I not insisted. All of them, even art historian, Bill Arnett, who's just a smidge younger than me and someone you'd never think of as a Katy Perry sort of person, thanked me afterwards."

"The film/documentary is so well done. Her talent and goodness as a person comes across loud and clear. I love her connection with her fans - even bringing many on stage to dance. I loved seeing how the girls - by the 1000s - connect with her."

"They clearly are inspired by her authenticity, her courage to be who she is despite much pressure early on to conform to what others thought she should be. She writes from her heart and they identify."

Fonda continued: "There's a telling and wonderful scene where she is sobbing because of the breakdown of her marriage to Russell Brant (Brand) and she has to decide whether she'll do the show (20,000 people are waiting in the arena) or not. We all left the theater feeling happy. She's that sort of presence."

Watch a clip from 'Part Of Me 3D' below: