Monday, October 4, 2010 7:10am ET by  
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Lady Gaga joins Yoko Ono onstage

Lady Gaga joined Yoko Ono at the We Are Plastic Ono Band concert in L.A.'s Orpheum Theatre last night (October 3).

The concert, Ono's first in L.A, marked the start of a series of celebrations for her late husband, John Lennon, who would have been 70 this week.

Sean Lennon, Thurston Moore and Sonic Youth's Kim Gordon also performed onstage with Ono at the concert.

Other events include a new exhibit, 'John Lennon, Songwriter', which will be unveiled to the public today.

Tonight Ono will also be the subject of an intimate interview about her husband and his legacy in the Grammy Museum as part of their ongoing series, 'An Evening With'.

Watch a clip of Lady Gaga onstage with Yoko Ono below: