The live duet happened at the star-studded charity event The Trevor Project at the Hollywood Palladium in California over the weekend.
Stars including Katy Perry, Jessica Alba and Emma Stone flocked to the Hollywood Palladium in California on Sunday, December 5 to help raise money for a suicide prevention organization. Perry took to the stage with "Glee" star Darren Criss to perform a duet of her hit "Teenage Dream", while Alba and funnyman Justin Long spoke to the crowd as part of the Trevor Project's annual Trevor Live comedy and music fundraiser.
Actress Jane Lynch presented Kathy Griffin with an award after the comedienne pledged the profits from her upcoming stand-up show to the crisis hotline for gay youngsters. Queen Latifah also performed, while married couple Taye Diggs and Idina Menzel covered "Ebony and Ivory", and Neil Patrick Harris and James Marsden sang together live - sealing their track with a kiss.
While Katy did charity, her hubby Russell Brand paid tribute to his mother Barbara as he accepted a prize at Variety's Power of Comedy gala in Los Angeles on Saturday, December 4. The British funnyman was the guest of honor at the first ever Power of Comedy event, where his "Arthur" co-star Dame Helen Mirren presented him with a trophy in recognition of his humor and his contributions to women's cancer charities.
The actress told the crowd: "He's the best, kindest and goodest bad boy you're ever going to be lucky enough to meet," while the "Forgetting Sarah Marshall" star dedicated the award to his mum, who battled cancer three times while he was growing up.
Brand said, "It's an area that's affected my life and continues to be important," although he couldn't resist making a joke by quipping: "It's given me some latitude to rationalize and justify touching women's boobs."