Pippa Middleton: Late Night Kiss with Boyfriend Alex Loudon

Pippa Middleton may have been partying and socializing until the wee hours of Sunday morning (think 4am!), but she and boyfriend Alex Loudon, the cricketer turned financier, seemingly weren't too whipped for a bit of PDA. The clearly on-again couple, both black-tie-clad, shared a smooch, as they waited outside for a taxi pick-up.

But just what was the occasion for this late night, make that really early morning, public display of affection for Kate Middleton's sister and her flame? They were in attendance at the Boodles Boxing Ball, a benefit event, hosted at London's Park Plaza Hotel, where they must have had quite the fun time watching the series of amateur boxing matches.

Talk about a knockout night. Pippa Middleton fit right in, as smashing as ever in a sultry, plunging ruby gown. No matter that guests the likes of former Spice Girl Geri Halliwell and Prince William's ex Jecca Craig each wore similar, low-cut red dresses. Alex Loudon no doubt had eyes only for Pippa.

Further proof of the rekindled Pippa Middleton and Alex Loudon relationship came in the form of an eyewitness who even caught the romantic action after the boxing ball, as reported to The Sun. "She had been yawning and was obviously shattered. But as he held her close she looked up at him and they shared a very tender kiss. It was sweet to watch," said the source. Indeed, the photos the British pair are pretty adorable, even with Pippa Middleton caught in a half-yawn, leaning on Loudon and looking half-asleep.

The source also added, "They looked very much in love. Pippa's dress was amazing and it showed off her wonderful figure." Speaking of, Pippa Middleton definitely proved the worth of her other assets with the low-cut gown, this time accenting her top half as opposed to her famous rear attraction.

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