On the Scene: Eminem, Ameriie, Rihanna, M.I.A., Ludacris, Christina Aguilera, B.o.B, Christina Milian, Kid Cudi

Eminem revved up thousands of festival-goers with a super-charged set on the first day of EPICENTER Twenty Ten at the Auto Speedway in Fontana, Calif., on Saturday (Sept. 25). KISS, Blink-182, Rise Against, and a reunited Bush were also on the bill. Em is nominated for four awards at the MTV Europe Music Awards, including Best Video for the Rihanna-assisted “Love the Way You Lie.”

The newly blonde Ameriie blew through the Windy City for the 2010 Picture of Strength event at the Chicago Illuminating Company.

X marks the spot. Rihanna departed one of her favorite eateries, AGO in West Hollywood, on Friday night wearing a white tank top and hat.

M.I.A., who is currently on a North American tour, took the stage in a green poncho at the Virgin Mobile FreeFest 2010 at Merriweather Post Pavillion in Columbia, Md.

Ludacris also made the crowd stand up at Saturday’s Virgin Mobile FreeFest. Luda will help select the top 10 CNN Heroes by serving on the network’s Blue Ribbon Panel of judges.

Christina Aguilera, looking classy in a floor-length gown, lent her voice to the opening gala fundraiser for the Lynda and Stewart Resnick Exhibition Pavilion at LACMA in Los Angeles.

B.o.B soared high during the BBC Radio 1Xtra Live concert at London’s Wembley Arena. He will return to the U.K. in November to open for Paramore following his U.S. solo tour.

Christina Milian spent her Saturday shopping with daughter Violet Nash and BFF Big Billy Clark in Los Angeles.

Kid Cudi threw up the peace sign for the camera before hitting the stage at the Details at Midnight performance in the Big Apple.