Production of the episode began today.
"We're all so thrilled to have Britney joining us once again. And just to head it off at the pass this time around: Yes, Mom, Britney's very nice and no, I can't get her autograph for you," said Craig Thomas, executive producer and co-creator of the show.
Spears' March 24 appearance as Abby drew 10.6 million viewers - 1 million more than the previous week - and received good reviews.
"How I Met Your Mother" airs Mondays at 8:30 ET on CBS and also stars Segel, Alyson Hannigan and Cobie Smulders.