Eva Longoria has been taking pole-dancing lessons. She’s been learning skills from pole pioneer Sheila Kelley at her S Factor studios in LA to prepare for a special episode of “Desperate Housewives.” Other stars of the series are also in training, we’re told. Longoria recently posted a picture of bruised arms on Twitter with the words: “My wounds from pole dancing! Wait til u see this episode of DH! Hilarious! Worth the pain!” Kelley, who’s also filming “Gossip Girl,” is holding a women-only class at her East 54th Street studio on Sept. 23.