» josh radnor

May sweeps has officially arrived. For TV fans that means a full month of explosive season finales, jaw-dropping cliffhangers and -- best of all -- a long list of famous guest stars from both the big and small screens.

Among the A-listers you'll see this season: a daytime TV queen (Elisabeth Hasselbeck), a 'Star Trek' icon (Leonard Nimoy) and a two-time Oscar winner (Jodie Foster) who will finally let Maggie Simpson do the talking.

Check out our guest stars gallery to see when all of Hollywood's finest will be sweeping their way onto your favorite TV shows.

"If there's one thing Ted needs, it's an encounter with Britney Spears."

It's not easy being the most sensitive guy on TV.

Bbut if anyone's up for the job, it's Josh Radnor, star of 'How I Met Your Mother.'

He dishes to AOL TV about the possibility of an all-musical 'HIMYM' episode, his genius plan for mothers everywhere and, of course, the big news about upcoming guest star Brit.