Lauren made the declaration after receiving a huge bouquet of flowers from Spencer this week - who knew he was such a romantic?
Sharing a photo on Instagram of her gorgeous surprise, Lauren simply said: "Best bf ever @spencermatthews."
It's not the first time Spencer has wooed Lauren. For Valentine's Day, he whisked Lauren off to Paris, where the couple enjoyed a romantic weekend while "shacking up" in the Presidential Suite of the five-star Hôtel Le Bristol!
Last week, Spencer spoke about his romance with Lauren, explaining that he's become a changed man since meeting her.
Party boy Spencer told The Sun: "It's nice to feel like I'm doing the right thing for once. This relationship has been different from the start."
Fans were made aware of Spencer and Lauren's relationship during series eight last year. Making a return to Chelsea after a few weeks away, Spencer told the boys that he had a new girlfriend, and it wasn't long before Lauren made her debut on the show.
Spencer's best friend and former co-star Hugo Taylor has praised Spencer and Lauren's romance, telling Reveal: "He's my best friend, I love him dearly and I've never seen him this happy. For me as a friend...that makes me very, very ecstatic for him and I think that she is a wonderful influence on him."
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