Newly Engaged Pippa Middleton Can't Stop Smiling as She Jogs Through London

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Pippa Middleton is one happy bride-to-be.

The Duchess of Cambridge's younger sister couldn't stop smiling as she went for a run in West London, England, on Wednesday. Pippa's workout included weights -- if you count the massive engagement ring she was wearing during her jog.

WATCH: Pippa Middleton Shows Off Her Super Toned Bod While Paddleboarding in St. Barts

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After her run, Pippa was greeted at home with a huge bouquet of flowers and a box from the restaurant Chiltern Firehouse. Quite the reward for exercising!

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Pippa has been glowing ever since news broke on Monday of her engagement to James Matthews. On Tuesday afternoon, the 32-year-old socialite stepped out wearing a darling white dress that perfectly complimented her new ring. When a reporter asked her how she felt, Pippa responded, "Couldn’t be happier," an eyewitness told ET.

MORE: Pippa Middleton on Kim Kardashian's Butt -- 'Mine Is Not Comparable'

Matthews, who runs the British hedge fund Eden Rock Capital Management, popped the question on Sunday in England's Lake District. The couple had been dating on and off since 2012, and rekindled their relationship in January after Middleton split from her ex, Nico Jackson, last October.

Pippa's highly anticipated nuptials will include quite the high-profile guest list, with royalty on her side of the family -- and a reality star on his. Here's a look at who can be expected at the couple's lavish wedding:

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