Linda Perry is airing her dirty (music) laundry!

The veteran songwriter has worked with some of the best in the business, including Christina Aguilera, Pink, Celine Dion, Alicia Keys and Gwen Stefani.

While these musicians have created some beautiful music together, the 49-year-old rocker admits that some artists were more challenging to work with than others.

toofab's Rachel Hoffman sat down with Perry, who was promoting her new VH1 series, "Make or Break: The Linda Perry Project," where she revealed some fun facts about collaborating with our favorite pop stars.

So, who is Linda's favorite star to work with? "Alicia Keys," she said without any hesitation. 

The 4 Non Blondes singer also answered quickly when we asked about the most challenging star to work with. "Christina Aguilera," she admitted, adding, "But, I'll say myself too. I'm extremely hard to work with."

Good save, Linda!

Check out the video at the top to see the rest of our speed round with Perry, and click "Launch Gallery" above to see more pop stars, then and now.

Don't miss "Make or Break: The Linda Perry Project," which airs on Wednesday nights at 10 p.m. on VH1.