The 23-year-old British singer accidentally showed off her thong when her pants split as she bent down, reported Ace Showbiz.
She donned a printed skintight jumpsuit with bustier top complete with track jacket for the event.
The singer, who plays Mia Grey in upcoming erotic thriller 'Fifty Shades of Grey', posted on Twitter a collage of pictures from the launch party.
"Thank you to everyone who supported the collection and me last night it was truly amazing partying along side so much talent. Thank you," the songstress tweeted.
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