London, Oct 5 (IANS) Singer Lady Gaga joined late Beatle John Lennon's widow Yoko Ono on stage to perform two songs at the end of the Plastic Ono Band gig in Los Angeles.

The 24-year-old singer paid tribute to Ono, 77, saying "Thanks for being so brilliant and such an inspiration to so many women".

The pair ended the evening lying next to each other on the top of a grand piano, the BBC reported.

Ono's late husband Lennon founded the Plastic Ono Band in 1969.

The concert comes ahead of a weekend of celebrations planned for Oct 9, which would have been Lennon's 70th birthday.

Ono is planning a series of peace-promoting events in Iceland that day and will light the Imagine Peace Tower, as she does every year on that day.

The tower was unveiled in 2007 near Reykjavik as a memorial to Lennon from his wife.

It is inscribed with the words: "I dedicate this light tower to John Lennon, my love for you is forever, Yoko Ono."

That will be followed by the Plastic Ono Band playing a special concert.