Last night Britney Spears took the stage at the Los Angeles Staples Center, where she opened with 'Hold It Against Me.'

It seems Britney is aware that her fans want to hear not only her latest music, but take a trip down memory lane with the music which made the pop star famous. The set included 22 songs, with favorites such as, 'Baby One More Time' (in a slower version), 'Toxic,' and 'Boys.' Britney also performed (live) her old ballad, 'Don't Let Me Be the Last to Know,' which was released in 2001 on her 'Opps! . . .I Did It Again' album. The song was written by Robert Lange, country singer Shania Twain and Keith Scott.

Nicki Minaj joined Britney for the show's close, which included confetti and fireworks.

Minaj, who is performing on the Femme Fatale tour, will not be joining Britney when the tour travels to Europe. On her Facebook Page, Minaj wrote, I will not be performing with Britney outside of the US and CANADA. Sorry!

Watch a video from the Femme Fatale Los Angeles show.

Watch Nicki Minaj perform 'Fly' live in L.A.