Credit: PI/

Baby got back!

Rihanna bared her booty in a sexy black PVC bodysuit while performing July 4 in Vancouver.

The 22-year-old singer -- now dating Los Angeles Dodgers outfielder Matt Kemp -- has been turning heads with her cutting-edge style for quite some time.

"My stylist Mariel Haenn and I always try to do something sexy, but never too girly," she told W magazine earlier this year. "We always try to put a little toughness in there."

She tells the July issue of Elle she respects designers "who aren't afraid to go outside the box."

Example: Jean Paul Gaultier.

At one of his recent fashion shows, "I saw girls who are thicker than me, beautiful and voluptuous and different ethnicities," she says. "That made me so excited. I thought, 'Okay, I can work that, for sure.'"

She also admires Gucci.

"There are definitely fewer black women in the high-fashion industry," she says. "One of the things I respected most about Gucci was that they did a print campaign with me. I'm a black girl on a fashion spread for Gucci. That was a big deal."