Alyson Hannigan Hey, I'm Pregnant Too!!

A very pregnant Alyson HanniganOn the heels of Jessica Simpson finally giving birth yesterday ... "How I Met Your Mother" star Alyson Hannigan proved she's ready to become the new Hollywood Queen of the Baby Bump during a stroll in L.A. on Tuesday.

The 38-year-old -- who is due in June -- has some enormous maternity shoes to fill.