"It says Happy Holidays and a Shiny New Year ... shiny new rear," DeGeneres joked after debuting the bootylicious card, which shows the two flashing their derrieres in front of a giant Christmas tree.
Kim's sister, Khloe Kardashian, spoke out about the revealing cover on Friday.
"If you got it, flaunt it!” Khloe, 30, told E! on Friday, Nov. 14. "People were just so hard on her during her pregnancy, that I think she feels so liberated to show everyone 'Look how bomb I look!' So I kind of love that she's saying a big eff you to the world."
What do you think of the card? Do you think Portia and Ellen will #BreakTheInternet?