Here's fame monster Lady Gaga at a NYC concert last week (left) -- and demure British songstress Amy Winehouse during blonder days in 2008 (right).
One of them had a highly publicized bad romance.
We're just ... Rah-rah-ah-ah-ah! Roma-Roma-ma-ah! Ga-ga-ooh-la-la!
Get TMZ Breaking News alerts to your inbox