But now that she's been properly inked, the Gaga took her performance art talents across the pond, hitting the catwalk for famous hat maker Philip Treacy's Michael Jackson-themed London Fashion Week show. (It's the designer's first in 13 years, though his hats are worn by countless celebs.)
Some of Treacy's famous pals such as Kim Cattrall, Grace Jones, Dita von Teese, Anna Dello Russo and Nick Cave sat in the front row of the show -- which required guests no matter how famous to walk through metal detectors before entering -- as models strolled out wearing some of Michael Jackson's most famous outfits on loan from one of the King of Pop's costume designers. (They're set to be auctioned off in December.) Gaga came out first in a flowy pink dress and towering shoes, declaring Treacy "the greatest milliner of all time."
Also strutting down the runway as part of the all-black cast of models was Alek Wek, who show off a hat with a giant glittery Jackson glove perched on it like a more flamboyant The Thing from the "Addams Family." The famous "Thriller" jacket also made an appearance, coming down the runway with a giant smiley face fascinator floating above it on a model's head. Other Treacy numbers? A giant jewel-encrusted face mask, one full body light tube encasement and a smattering of curlicue fascinators that looked ready for a royal party if we ever saw one.
Lady Gaga is (obviously) a Philip Treacy fan, having worn his famously eccentric headpieces on numerous occasions, including the famous telephone hat in the "Telephone" video. Another, more buttoned-up Philip fan? The Duchess of Cambridge, who has worn Treacy's fascinators at a handful of royal fetes.
Check out pics of Gaga doing her thang, as well as some of Treacy's outrageous toppers below! (Can you spot the "Thriller" jacket?)