The 'Tik Tok' singer - who is currently supporting the star on her 'Last Girl on Earth Tour' - is learning a lot from the 'Umbrella' hitmaker and thinks it would be great to release a track together.
When quizzed on the possibility of a duet, Kesha said: "I would love to. I mean, it's kind of been tossed around. There's not really much time that we've spent writing and stuff on this tour, because it's been so crazy, but it's definitely an idea I'm not opposed to.
"I don't know what she would be learning from me, aside from how to look like a maniac, but I've definitely learned a lot from her. I've only been performing pop music for under a year, so I'm relatively new to the arena thing. It's terrifying, so I really do, every night, watch her, and she's so graceful and so sweet and so bad*ss."
The 23-year-old singer was thrilled to have performed at New York's Madison Square Garden last night (12.08.10), and admitted the concert was a landmark in her career.
Kesha told MTV News: "It's a landmark in my career - it's just an epic venue. It definitely means a lot for me to be playing there, especially with Rihanna, because she's so incredible."