madison square garden Ke$ha singer fashion blondeKe$ha sported lace tights -- and not much else -- after opening for Rihanna at New York's Madison Square Garden last night.

Ke$ha recently said she would "love" to collaborate with her tour mate.

"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," she told MTV News.

"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," Ke$ha admitted. "It's terrifying, so I really do, every night, watch her, and she's so graceful and so sweet and so bad*ss."

Rihanna recently collaborated with Eminem on his newest single, "Love The Way You Lie."