It takes a powerhouse to go toe-to-toe with Mick Jagger and successfully pull off Merry Clayton's vocals in "Gimme Shelter," one of the most recognizable female vocal parts of all time and one of the Stones' greatest songs.

But for the Stones recent 50th anniversary shows in New York and London, they pulled out all the stops to find big-name female special guests who could do just that. Florence Welch (of Florence + The Machine), Lady Gaga and Mary J. Blige (twice) all joined the band to fill in for Ms. Clayton.

Mary J. Blige

Mary J was invited to both a London and an NYC show and did an admirable job, though not the best, in my opinion.

Florence Welch

Flo's a little more my speed. Not only did she give Mick some attitude -- in a good way -- to work with, her voice is just killer.

Lady Gaga

There's a fine line between "some attitude" (see: Flo) and basically upstaging the legendary Mick Jagger...and while it's always nice to hear her actually use her amazing voice, Gaga might have crossed that line.

Bonus: Fergie

After a few years of silently, guiltily ABSOLUTELY LOVING this rendition of "Gimme Shelter" -- because really, if I came up to you and said, "You've GOT to hear Fergie sing 'Gimme Shelter''s awesome!" wouldn't you think I was nuts? -- I'm ready to admit it: This rendition, from the Rock & Roll Hall of Fame's 20th anniversary concert, is effing incredible. Holy cow. The girl just kills it. I literally get chills.

So...who's your favorite?