I have the Nike dance cargo, and I don't think its those particular pair although they really do look alike, I could be wrong but I think these might be from KOS USA. Cathe has a link to the clothing line on the home page under clothing.
Again, I could be wrong about both, but I have seen her wear cargos-they appeared to be the KOSUSA ones before in pics-I think she had orange ones on?
Edit: I just checked out the KOS site, you cannot order there, I did find cargos similiar, but no cigar, unless they made a newer style. I do know however you can find KOS clothing on sandiegofit.com along with a ton of other very cool brands, love the brazilian lines, but beware taller, longer torsed women, they run tight and can cause "camel toe"x( eek!
Just checked out NIKE.com, now I have to buy new workout clothes, thanks bjammin13!