Miley Cyrus Gets 'Props' from Her Costar
02/21/2008 AT 02:20 PM EST
"I'm going to give her props for that. She's doing an amazing job and I’m not really surprised by her success because she definitely deserves it," Knowles told PEOPLE recently. "She is, and she always has been [a good role model]."
The 17-year-old, who plays Amber Addison in the Hannah Montana series and movie, adds: "She's really talented, and she's really spiritual and she has a good heart."
For the girls, it’s not all work and no play. Knowles reveals that despite their very busy schedules, the two make time to pal around off set.
"It’s not a ritual, but ... every Friday we have a live audience show, and me, Miley and Anna Maria will go shopping afterward or just spend the night at [Cyrus's] house, and just do fun girl things. Or she'll invite us to watch movies, eat popcorn, be goofy in our PJs."