Holy bling! Hills alum Casey Reinhardt got engaged to her boyfriend, Sean Brown, on Wednesday, Aug. 12, and he sure did well with her giant engagement ring.

The Laguna Beach star, 29, took to her Instagram to share the news with her fans after the proposal went down.

"My breath is taken away… I've never felt happier in my entire life!!!" she gushed, alongside a photo of her beau on bended knee. "I love you so much @seanmbrown1!!!! How lucky am I to have found my soulmate… I can't wait to spend the rest of my life with you!!!!!!!!!!! Happiest day of my life!! I feel so blessed!!!"

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Reinhardt, the sister of Paris Hilton's ex Doug Reinhardt, followed up her initial announcement with a close-up look at her engagement bling. "My fiancé!!!!!" she wrote, alongside a snap with her future husband. In the pic, the self-proclaimed Cupcake Queen holds up her left hand and shows off her gargantuan pear-shaped diamond ring.

Since she first appeared on Laguna Beach in 2005, Reinhardt has actually found her own personal path to success, opening a popular bakery called Casey's Cupcakes in the OC.

Her fiancé is the son of Denise Brown, the sister of the late Nicole Brown Simpson. Like his future wife, Sean is also an entrepreneur. Interestingly enough, he has one acting credit in a 2010 short called The Pain Within, and he's worked on set as a wrangler on several projects.

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