The 22-year-old singer, whose relationship with Rob ended after he accused her of cheating on him, expressed her desire to have get intimate with the 'Twilight Saga' actor, reported Contactmusic.
"I would marry Robert De Niro... I would definitely, definitely shoot Rob Kardashian," said Rita.
Last year Rob had posted comments on his Twitter account accusing Rita of cheating on him with 20 other men.
But Rita said she had to end the relationship with Rob because she didn't have any time to see him.
"I'm not going out with Rob. We were close for a while, but it didn't work because I was never there. I was like a ghost. I used to get so frustrated with myself and then wonder why I was angry, so I decided it was best to keep it friendly - especially at the moment, when there's so much going on," said Rita.