Riddle Me This

"How come everytime you come round my London, London Bridge wanna go down?"

Those words listed above are taken from the chorus of Fergie's debut single London Bridge [Oh Shit!] I ain't gon lie. I have no idea what the hell she is talking about in that line either. But after a few minutes spent carousing the web I think I found an answer over at ew.com. Big ups to Rebecca B. for helping me get to the bottom of this.
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Q:"How come everytime you come round my London, London Bridge wanna go down?"

A:I believe "London Bridge" might be referring to her British heritage and some fine dental work.I'll let you make the rest of the connection.

Oh Fergie you so cleva!