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Justin Simpson, Sydney Simpson, Casey Reinhardt, Sean Brown, Wedding, Exclusive

Splash News

Casey Reinhardt's weekend wedding had a few special guests in the audience.

E! News can confirm two of O.J. Simpson's children—Justin Simpson and Sydney Simpson—were both in attendance as the Laguna Beach star exchanged vows with Sean Brown.

"Justin was in a celebratory mood and having a good time," a source told E! News. "It was a very lavish wedding, no expense spared."

After a sunset ceremony that lasted about 30 minutes, our insider said the celebrations went on past 10 p.m. Both Justin and Sydney were "very chummy" with Aunt Denise Brown and they sat in the same row for part of the evening.

The groom, who is the nephew of the late Nicole Brown Simpson, wore a white tuxedo as he said "I Do" to Casey at The Resort at Pelican Hill in Newport Coast, Calif. Meanwhile, the bride sparkled in a Zuhair Murad gown that featured plenty of bling.

Justin Simpson, Sydney Simpson, Casey Reinhardt, Sean Brown, Wedding, Exclusive

Splash News

For those curious about Sydney and Justin's lives today, both adults have managed to obtain some normalcy away from the tragedy that made them famous figures.

Sydney went on to attend Boston University where she graduated with a BA in Sociology. She currently lives in St. Petersburg, Fla. As for Justin, he's finding success as a real estate agent and living near the same town as his older sister.

As for their latest trip to Orange County, it's safe to say the brother-sister duo enjoyed one unforgettable evening. In addition to a fireworks display, guests were also treated to a surprise performance from Sara Bareilles.

Casey Reinhardt, Instagram

Instagram

"Last night was the most magical, incredible, most emotional night of my life!!! I became Mrs. Casey Beau Brown and I get to spend the rest of my life with the most amazing man who ever walked this earth," the bride shared on Instagram. "I'm so happy, so in love, and so overwhelmed with emotion just thinking about how beautiful the rest of our lives are going to be together."

If you're thinking the wedding has lost its magic two days later, think again! The self-proclaimed cupcake queen is still in awe of how perfect her day went.

"Still dreaming about the best day of my life..." Casey wrote on Instagram Monday afternoon. "You will forever be my always @seanmbrown1. I love you @seanmbrown1 #CaseyandSeanSayiDo."

Justin Simpson, Sydney Simpson, Casey Reinhardt, Sean Brown, Wedding, Exclusive

Splash News

For more on Justin and Sydney Simpson's evening out, watch E! News tonight at 7 and 11 p.m. only on E!