Citigroup may have had yet another reason to hype the stock of now-defunct WorldCom. The banking giant apparently made unspecified loans to the company's former CEO Bernie Ebbers that were secured by Ebbers' WorldCom shares, documents obtained by The Post indicate. Citigroup denied allegations in a recent lawsuit that $679 million in loans made to Ebbers by Citi's Traveler's unit in 1999-2000 were collateralized with Ebbers' WorldCom stock. But WorldCom documents seem to show that Ebbers had pledged some portion of his WorldCom stock for other loans made by Citigroup. A letter sent to Ebbers on April 2, 2002 from WorldCom board chairman Stiles Kellett, outlines loan agreements between Ebbers and WorldCom for which Ebbers pledged his WorldCom stock.