Related: Lady Gaga Debuts Dark Hair While Showing Off Bruno Mars T-Shirt — and Fans Think It's a Collab Hint As the crowd went wild, Mars and Gaga smiled at one another before launching into ...

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 ...