Happy Halloween! It's no secret that Halloween is Ellen's favorite holiday, and this year her celebration's bigger than ever! Tune in to see the costume that everyone's going to be talking about tomorrow!

She'll be joined by two of her favorite people on the planet! First, it's NEIL PATRICK HARRIS, star of "How I Met Your Mother" and the new special, "A Very Harold and Kumar 3D Christmas." He always knows just how to crack Ellen up. He's so charming and clever, it's spooky!

Ellen will also welcome one of her good friends, BETHENNY FRANKEL. This housewife mogul fashionista is guaranteed to have a ghoulishly fun time with our host -- and bring some Halloween magic! For this Halloween spectacular, Ellen has a more than few tricks that are sure to be a real treat! Don't miss it!