Holly, who starred alongside her sister Heidi and Lauren in the US reality show, announced her exciting news on Twitter last night (14 October) with a cute photograph of herself, her fiancè Richie and her engagement ring.
Alongside it, Holly commented: "Happiest girl in the universe!"
Before she made her announcement, however, it seems sister Heidi might have pipped her to the post.
On Sunday, Heidi told her followers: "A HUGE congratulations to my amazing loving sister on her engagement to Richie!
"Answered prayers! Love u so much & am so ecstatic for u!"
On Sunday, Lauren revealed that her boyfriend William Tell had proposed to her with a giant diamond ring.
But given the frosty relationship between Lauren and the Montags, we're presuming that they won't be discussing wedding dresses together...
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Copyright: Instagram Mark Wright