Christina Aguilera has really evolved as an artist.
Here's the 18-year-old former Mouseketeer back in 1999 (left) -- and 11 years later, the 29-year-old mother of one in her new music video (right).
Not myself tonight ... clearly.
You've Come A Long Way Baby
5/3/2010 4:10 AM PDT BY TMZ STAFF
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