Celebrity | How I Met Your Mother Encore! Britney Back on Sitcom How I Met Your Mother co-creator: 'We’re all so thrilled' By Sam Gale Rosen Posted Apr 28, 2008 2:55 PM CDT Copied In this image released by CBS, Josh Radnor, left, speaks to Britney Spears, who portrays receptionist Abby, in a scene from "How I Met Your Mother." which aired on March 24,2008. (AP Photo/CBS, Monty Brinton) Britney's back for a second stint guest-starring on How I Met Your Mother. Spears' first cameo netted the show its highest ratings ever, and the new episode began filming today, reports People. “We’re all so thrilled to have Britney joining us once again," says the show's co-creator. Read These Next Suspect in Brown University shooting is a Wisconsin man, 24. A beach massacre at a Jewish event in Australia killed 12. Mom of Karoline Leavitt's nephew has a message for her. Father and son killed 15 people on Bondi Beach, police say. Report an error