Katy Perry's 3-D docu-concert "Part of Me" will showcase the darker side of the pop darling's roller-coaster ride to fame, including her divorce from Russell Brand.

Still, there will be tons of fun thrown in the mix. In between scenes from her 2011 worldwide California Dreams trek, the July 5 film will also feature footage of the singer's family, including a water-park outing with her sister.

In an almost minute-long teaser clip from the film, Katy's older sister, Angela Hudson, talks about how she grew up promising to work with Katy "when she made it big." In between takes of the duo in choir and backstage at concert halls, Angela explains, "My sister, not only does she work hard on tour, but she likes to play hard on tour.

"Anytime we go to a city when we have a day off, she always likes me to explore something fun with her," she continues.

With her hit "Firework" serving as appropriate background music, KatyCats catch a glimpse of the Perry sisters basking in the adventures of a water park. But what would any amusement park be without a little action-ride anxiety? Asked how she's feeling before going on a bungee-jumping ride, the pop star responds, "I feel great. I'm really, really excited about my sister, who is scared of heights."

Unfortunately, Angela doesn't appear to enjoy the ride as much as Katy thought she would, as the older sis offers cameras a frown.

MTV News recently caught up with Perry at the Pepsi Fleet Week "Part of Me" Concert, where the patriotically-dressed songstress told us about how deep the film will take fans.

"It's the most intimate I've ever been. I mean that in a non-sexual way ... I mean it in a vulnerable way," she explained. "And so I'm not scared of it because I think it's important for me, and important these days, for people to not think people in my position are perfect and that if they want to achieve this type of dream or achieve a goal that they have to be flawless. They don't."

What do you think of the new "Part of Me" clip? Share your opinion in the comment section!