Bride-to-be Pippa Middleton glows in sleeveless gown and familiar earrings at charity ball

Pippa Middleton and James Matthews stepped out for a charity ball Thursday night, just weeks before they tie the knot on May 20. They attended the ParaSnowBall at the Hurlingham Club in London, and they sure do clean up nicely.

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The bride-to-be was glowing in a blue, embellished Erdem dress and cut-out Sandro sandals -- but perhaps the most noteworthy part of her outfit are her earrings. Why? Because it looks like they're the same Robinson Pelham pair she wore to her sister Kate's wedding in 2011.

Have a look:

Credit: Getty

Aside from that little fun fact, people also couldn't help but notice the toned arms Pippa flaunted in the sleeveless gown. Perhaps this means her wedding dress will be sleeveless, too? That still remains a mystery -- sorry! However, we do know that little Prince George and Princess Charlotte will be page boy and bridesmaid, respectively. We also know that Prince Harry's girlfriend, Meghan Markle, is invited after all -- but there's a caveat.

PHOTOS: Get a closer look at Pippa's ball ensemble

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