Christina Aguilera, Lil’ Kim, Mya, & Pink – “Lady Marmalade” – (2001)

Four big female stars (plus Missy Elliott introducing them in the music video) came together for Baz Luhrmann’s Moulin Rouge to record this cover of Patti LaBelle’s 1974 hit. It was a Hot 100 #1 and #1 all over the world. It was a big song 13 years ago (wow) known as much for its then-risqué video as for anything about the song musically. Yes, this one is slightly more than a “duet.”