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Faith Cummings
Oct 26, 2016 @ 12:15 pm

Lottie Tomlinson, younger sister to One Direction's Louis Tomlinson, is one of the most beloved beauty girls on Instagram and is just shy of 3 million followers. If you have been keeping up with her posts, then you know she's releasing a slew of lip and nail kits for her Nails Inc. collaboration, MatchBox. And the partnership is exactly what the 18-year-old makeup artist toasted to in London Tuesday night, with a ton of familiar faces showing their support.

Naturally, big bro Louis turned out for the festivities and kept things cool and casual in a white T-shirt and black jeans. He was accompanied by stylish girlfriend Danielle Campbell (above, left), who was fall-perfect in all black—a silky crop top, leather lace-up pants, and suede thigh-highs to be exact.

David M. Benett/Getty

RELATED: Lottie Tomlinson x Nails Inc Is Coming Soon

Lottie (pictured above with her brother) kept it sporty in Fenty x Puma white lace-up pants ($150; bloomingdales.com) and an on-trend black lace bralette that showcased her toned abs for the launch celebration at Tape London.

On Wednesday, the 1D singer shared a sweet message about his sister's accomplishment. "So proud of my sis last night :)," he wrote in the caption​​​​​​ to a photo of the siblings at the event. "Well done, Lots. Love you."

RELATED VIDEO: The 10 Lip Colors You Need for Fall

Lottie's limited-edition MatchBox nail and lip kits come in four combinations: a hot pink duo, coral pairing, orange twosome, and mauve coupling. They each retail for $19 and are available at Nails Inc.'s website now.

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