Like Britney Spears before her, Jennifer Lopez is set to guest star on How I Met Your Mother in March. She will play Annie Appleby, "an outspoken self-help guru who makes it her mission to break caddish Barney (Neil Patrick Harris) of his womanizing ways." Sounds interesting! If I find out the exact air date, I'll be sure to tweet it or mention in on the blog. Don't forget that J.Lo domination (Love? + "The Back-Up Plan") goes down in April!