Everyone loves Dolly Parton! Everyone, including Saturday Night Live cast member Melissa Villaseñor. Melissa broke out her Dolly impression during SNL‘s “Weekend Update” segment on Dec. 12. Dressed as Dolly, Melissa treated viewers to a few of her favorite holiday songs, including “Holly Jolly Christmas,” a mashup of “Jingle Bells” and “Jolene,” and “9 to…