Lady GaGa5 

Lady Gaga flew into LA yesterday for a really special night: Singing alongside Yoko Ono at the

“We Are Plastic Ono Band” concert at the Orpheum Theatre. The gals rocked out for a sold-out audience, and it looked like an amazing night.
Lady Gaga and Yoko Ono.

Gaga tweeted after the concert: "WE ARE PLASTIC ONO. I got to sit in as a guest musician tonight, what a legendary band+mother, Yoko."
Gaga had more reason to be a happy superstar yesterday, she posted: "Today THE FAME spends its 100th consecutive week on Billboard. I wrote it myself + sang it live everynight. Thanku for believing lilmonsters."