Is Pippa Middleton single and ready to mingle?

Pippa Middleton is reportedly back on the singles market after breaking up with her stockbroker boyfriend Alex Loudon.

The Duchess of Cambridge's younger sister has been hanging out with her aristocratic ex George Percy instead.

Sources last night said Pippa, 27 - whose curvy rear wowed millions watching the royal wedding - will "stay good friends" with Alex, 30, reports The Sun.

Britain's most sought-after date has not been seen with the professional cricketer turned city broker for weeks.

One source close to Alex said: "Pippa has become very high profile and it's put a strain on things. They're moving in different circles."

Pippa shared a three-hour romantic meal with George - son of the fabulously wealthy Duke of Northumberland - at Le Cercle restaurant near London's Sloane Square last week.

They sneaked back to his posh pad and did not emerge until 2am when George, 26, walked Pippa to the lobby and gave her a goodnight hug.

Just hours later they were at Queen's tennis club in West London where they watched Andy Murray play.

Meanwhile, Alex has been keeping a low profile at his home in Fulham, West London, and at work.

George, heir to his dad's £315 pounds fortune, dated Pippa when they were flatmates at Edinburgh University.