The business mogul said that he made the 'Born This Way' singer famous by allowing her to headline the Miss Universe pageant in 2008.
"We've had a lot of great people, and you don't pay them anything because it's one of the biggest audiences and my people told me, 'Nobody knows who she is but there's this woman with good talent named Lady GaGa'," Trump told Hollyscoop.
He continued: "I said, 'Give me a break'. And then they said, 'She's really good'. So I said, 'I don't care, if you like her, put her on'.
"So we put her on… It was live all over the United States and all over the world and the next day, nobody was talking about Miss Universe, everybody was talking, 'Who was the woman, who was the entertainer? She was unbelievable'."
GaGa was recently named in the longlist for the 2012 Oscars 'Best Song' category for her duet 'Hello Hello' with Elton John in Gnomeo and Juliet.
Earlier this month, the singer claimed that she didn't start the trend for dance music in the global charts, saying that she was just one of a few artists pushing forward with the genre.
Watch Lady GaGa's video for 'Bad Romance' below: