London Fashion Week kicked into high gear on Sunday, with a hectic day of shows that culminated in Lady Gaga taking a starring turn on celebrity milliner Philip Treacy's catwalk.
Earlier in the day, punk queen Vivienne Westwood upstaged her own models in a finale that saw her strutting down the runway with a climate change slogan T-shirt.
Fashion doesn't get more theatrical than this.
Day Three of London's twice-a-year style extravaganza was packed with runway previews by some of the capital's most popular designers: Westwood, Paul Smith, Jonathan Saunders, Mary Katrantzou and Alice Temperley.
But Lady Gaga, in a hot pink shroud, stole the show when she opened her friend Treacy's Michael Jackson-themed comeback show. Treacy, who has designed fanciful hats for countless royals and celebrities, has not shown at the fashion week for a decade.
Raising her arms and looking up, the pop icon announced: "Ladies and gentlemen, the greatest milliner in the world: Philip Treacy."
She was joined by fellow celebrities Kim Cattrall, Grace Jones, and Nick Cave in the front row at the show, which featured Jackson's legendary stage costumes paired with Treacy's headgear.
The spectacle topped a long day of shows that featured onetime punk priestess Westwood, who championed her favourite cause - climate change - as she closed her runway preview.
The orange-haired designer used two models to unfurl a banner proclaiming a climate revolution, then strutted down the catwalk herself in a "Climate Revolution" T-shirt, shorts and makeup that looked as if she had a giant black eye.
"I loved it," former model Jo Wood said. "There was so much there that I wanted. And I love Vivienne as a person. She's the one show I won't miss."
Some of Westwood's severe outfits looked like they were from just before the Mad Men era, when US first lady Mamie Eisenhower helped set conservative fashion trends.
Some outfits looked silly, others - evoking the Jackie Kennedy era that came a few years later - appeared wonderfully retro and chic.
Did the ensembles work? Westwood, ever the iconoclast, claimed she simply didn't care, insisting she was only interested in using fashion as a way to air her views on the environment.