British "It" girl Pippa Middleton is single... and ready to royally mingle.

Middleton -- who nearly stole the show at big sister Catherine's wedding to Prince William -- has split with longtime beau Alex Loudon, according to several reports.

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Even though Loudon attended the royal wedding with Pippa, the pair wilted under the glare of the international spotlight. "Pippa has become very high-profile, and it's put a strain on things," a source told The Sun. "They're moving in different circles."

Pippa, 27, and Loudon, 30, a cricket player-turned-businessman, haven't been seen together for several weeks, but Middleton has been spotted hanging with her ex, George Percy, most recently on a trip to Spain in May.

Percy, 27, is the eldest son of the Duke of Northumberland, making him heir to a large fortune, according to Associated Press.

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