The X Factor judge praised the Grammy Award-winning wordsmith for being able to understand her image and character perfectly and channel that into the songs.
"Diane wrote two songs for me - 'Counterfeit' and 'Bitch on Heels'," Tulisa told the Daily Star.
"She studied me first as a character and wrote them completely from my point of view so it sounds like something I would write myself. She was amazing."
Tulisa continued: "I did so many songs, and only a certain amount got on the album. I went with songs by the people that got me as an artist as I'm very expressive about who I am and what I'm about."
Before working on tracks, Warren played Tulisa songs that she had already written for her.
"Her exact words to me were, 'Wanna hear a f**king hit?' and she just pressed play on the recording. I was like, 'Wow'."
Warren has previously written tracks for Aerosmith, Toni Braxton and The Wanted.
Meanwhile, Tulisa will release her new single 'Live It Up' in the UK on September 9, while her debut solo album will follow later in the year.
Watch the music video for Tulisa's 'Live It Up' below: