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Lottie and Jourdan at the London party
Attending the launch of the new Limited Edition HTC One M9 INK on the rooftop of the ME Hotel, Lottie looked delighted to be rubbing shoulders with a host of other famous faces including Donna Air, Sarah-Jane Crawford and Conor Maynard.
The teenager, who has a strong resemblance to her half-sister, wore a monochrome-print dress and black cutout boot heels.
Lottie celebrated the new device, which is emblazoned with a body art-themed illustration that Jourdan designed. "Body art is an important part of my look and, as I don't go anywhere without my phone, it makes perfect sense to combine the two to create a uniquely personalise accessory," said the model.
The 17-year-old looked super stylish
"The opportunity to work with a brand that is famous for design and to put my own creative stamp onto a beautiful looking handset was something that really appealed."
Lottie's appearance at the party comes after she made her runway debut at Paris Fashion Week in March, gracing the catwalk for Sonia Rykiel.
The blonde beauty has seen her modelling career go from strength to strength after being signed by Storm Models – the agency who discovered Kate – on her 16th birthday. She has since featured in i-D and Teen Vogue magazines, as well asstarring in a Red Valentino campaign for autumn/winter 2014.
Jourdan was showing off her supermodel physique
Lottie's model potential was first recognised when she was a bridesmaid at Kate's wedding to rocker Jamie Hince in 2011. However, being just 13 years old at the time, she was too young to be signed to an agency, so settled with test shots at Storm instead.