"I'm so honored to have a small part in your giant musical legacy," Bruno Mars told Lady Gaga upon accepting the award for best pop duo/group performanceLady Gaga and Bruno Mars won the Grammy Award for best pop duo/group performance with "Die with a Smile.

In a stirring tribute to a city in crisis, Lady Gaga and Bruno Mars sang "California Dreamin'" at Sunday night's Grammys ceremony.

Lady Gaga and Bruno Mars teamed up to offer an emotional tribute to those affected by the devastating L.A. wildfires with a duet of the Mamas and the Papas classic “California Dreamin'” at Sunday night’s Grammy Awards.