21 yr old jesse mccartney is turning hs bk on singn 4 a litl while to invade the small screen, joining the cast of abc family's comedy drama greek. entertainment weekly reportd monday, sept. 29th that the singer wil star in the series for its mid seasn return in spring 2009. jmac wil reportedly portray the role of andy a high skul frend of calvin. mre on ths news asap.