CBS confirmed Monday that Britney Spears will pay another visit to "How I Met Your Mother." Spears will reprise her role as bubbly secretary Abby in the May 12 episode. When last seen, Abby was flirting with womanizer Barney (Neil Patrick Harris). The new episode, which began production Monday, has Abby and Barney sharing their mutual dislike of Ted (Josh Radnor) and acting on it. "Desperate to get a rise out of his former pal, Barney pops a surprising question to Abby," CBS said Monday. Spears' appearance in the March 24 episode boosted the show's viewership to 10.6 million viewers, compared with 9.6 million the previous week.