When Britney dated Barney...

Britney Spears will make her second appearance on CBS' "How I Met Your Mother" May 12, Her first guest spot back in March gave the sitcom boffo ratings so no doubt this one will too.

Britney, who seems far better these days thankfully, will again play Abby - a receptionist who had a mad crush on Ted. Barney (Neil Patrick Harris) is on the outs with Ted so he and Abby team up to make him jealous. They go on some kind of date, even dressing alike for it, and flaunt their "relationship" in his face.