The pop singer wore a wedding look on the cover of the magazine's 20th anniversary issue Billie Eilish is a “bad bride ... the star wears a Gucci Victorian-era bridal cape with Gucci pants ...

She famously ditched her signature slime green strands and reemerged as a blonde bombshell just one week ago. And Billie Eilish is clearly still smitten with her new look as she took to Instagram ...