Taylor Swift had two BIG stars join her on stage last night during a concert in L.A.: Nicki Minaj and Ellen DeGneres!

Minaj, fresh off her VMA win at the Nokia Theater, popped next door to the Staples Center after the awards ceremony to perform her hit "Super Bass" with the country singer.

Taylor has long been a "Super Bass" fan, rapping the song on a radio show way back in February -- and got a special shout-out from Nicki for her support. After singing, Minaj toldthe crowd "Taylor started this 'Super Bass' frenzy and I want to thank her from the bottom of my heart, I love you Taylor."

The wigged-out rapper wasn't the only superstar to hit the stage with Taylor last night -- Ellen DeGeneres made an appearance too ... and played instruments on stage!

Ellen popped up while Swifty sang "Our Song," with DeGeneres picking up the triangle and even playing the washboard.

Swift had a ton of guests while playing in L.A., including Justin Bieber, Jason Mraz and Hot Chelle Rae.

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