Many of us gasped when we first heard Gwyneth Paltrow sing Cee Lo’s “Forget You” on “Glee” in 2010, but this was not Paltrow’s singing debut. In 2000, she showed off her belting talent in the film “Duets” alongside Paul Giamatii and Maria Bello. Soon after her guest appearances as Holly Holiday on “Glee,” Paltrow starred as a country music star in “Country Strong.” At the 2011 Grammy Awards Paltrow flaunted her vocals on “Forget You” once more alongside Cee Lo and singing puppets.