Credit: Martin Karius/Splash News

Leggy Lady!

Pippa Middleton showed off her tan, toned legs in London Wednesday afternoon.

Back from her weekend in the country with beau Alex Loudon, the 27-year-old looked relaxed and chic back in the city. No word yet on what designer she was wearing, but Possessionista speculates -- convincingly! -- that Middleton was rocking a $59.50 colorblock dress from Zara!

Middleton's a busy lady these days: Duchess Kate's kid sister has a lobbyist gig at college roommate George Percy's geothermal-energy firm, and she's launching her own party-planning company. 

"Pippa has an amazing little black book of contacts," an insider told Us Weekly. "She wants to be back on the scene!"