Liam and Sophia made a cute couple as they posed for the cameras on Tuesday night (25 March) at a party thrown for Lou in central London.
They are childhood friends who met while attending St. Peter's Collegiate in Wolverhampton. They confirmed they were dating in August 2013.
At the time, a source said: "Liam has really fallen for her. It's getting very serious, very fast," said an insider. "She's a sweet, normal girl who likes Liam for who he is, not because he's in the most famous boyband in the world."
Last night, Liam and Sophia joined a host of famous faces including Liam's bandmate Harry Styles, singer Ed Sheeran and TV presenter Caroline Flack at the glam event held at The Ace Hotel in Shoreditch.
(Yes, we know, Harry Styles and Caroline Flack at the same party. Interesting...)
Guests sipped on raspberry & vanilla cocktails, while enjoying a DJ set and private gig, and no doubt checking out copies of Lou's book, The Craft.
Lou is well-known to 1D fans for being the band's personal groomer. In fact, she actually has a whopping 1.4 million Twitter followers, many of whom we' presume are dedicated Directioners. She's also global brand ambassador for Fudge Urban. Her book is a DIY hair and beauty book offering tips, tutorials and ideas for edgy hair and beauty looks.
It's available from 1 April.
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Watch 1D's 'Midnight Memories' music video below: