Pippa Middleton flashes glitzy engagement ring at 9/11 event

Future wife ... and businesswoman?

Pippa Middleton may be a successful author and party planner, but don't count her out of a future career in business!

The newly engaged 33-year-old rubbed elbows with stockbrokers on Monday at the 12th BGC Annual Charity Day in London. The event commemorated the 658 employees lost in the World Trade Center attacks on 9/11. Middleton was all smiles while joining brokers as they made deals around the world.

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Duchess Kate's little sister showed off her enviable figure in a fitted grey jumpsuit that she paired with shoes of the same shade and a powder blue clutch. She opted for a fuss-free hairstyle with some casual waves.

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But everyone's eyes seemed to gravitate towards the big rock she flashed on her ring finger. Her longtime beau, hedge fund manager James Matthews, proposed to the brunette beauty in July. Experts believe the glitzy engagement ring may have cost her 40-year-old fiancé nearly $300,000.

And with some serious bling like that, who could blame Pippa for never wiping that grin off her face?

Middleton's latest appearance comes a week after she celebrated her 33rd birthday. She chose to keep her special day private, as she was spotted around London with her mom. The mother-daughter duo stepped out in style in coordinated outfits.

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