Victoria's Secret Show: Rihanna Grabs Model's Underwear Onstage!

Rihanna performs on stage during The Victoria's Secret Fashion Show 2012 in New York, NY November 7, 2012. Credit: Gregorio T. Binuya/Everett Collection

Rihanna's not about to be upstaged by anyone -- not even a few nearly naked , crazy sexy Victoria's Secret Angels!

At the annual Victoria's Secret Fashion Show, taped in NYC on Wednesday night, the "Diamonds" singer, 24, was among the pop star guests joining the models on the runway. (Justin Bieber and Bruno Mars also made musical appearances.)

For her over-the-top performances, Rihanna donned two looks.

First, the chart-topper wore a revealing black corset gown with a thigh-high slit plus pearl-rimmed shades and choker and long lace gloves and sexy boots as she strutted alongside the stunning angel Doutzen Kroes.

For her second onstage look, the Barbados-born superstar went all pink -- pink bra and underwear with a sheer, similarly tone slip and pink booties.

During one memorable moment in the show, she even copped a feel of one sexy model passing her by.

Indeed, before the show began, Rihanna told reporters on the red carpet that she was looking forward to checking out "t-ts and ass!" during the spectacle.

"I need to hit the gym after seeing these girls," she joked. "When I sing I'm going to suck in [my stomach] and arch my back and try to remember my songs at the same time."

Tune in to Facebook Live at 4 p.m. PT/7 p.m. ET to see the singer chat with Bravo's Andy Cohen about her new album, Unapologetic. You can also submit your own questions for the star.