Singer-actress Lady Gaga took home her first Oscar in the Best Original Song category for Shallow -- the popular track from the hit film, A Star Is Born.

The award went to Gaga and co-writers Mark Ronson, Andrew Wyatt and Anthony Rossomando. In her speech, she thanked her director and co-star Bradley Cooper, for "believing in us". "Bradley: there's not a single person on the planet that could have sung this song with me but you," said Gaga, who got emotional after the win.