Once Upon A Time Frozen Crossover Featuring Kristen Bell [SPOILERS]: Zelena And Rumplestiltskin Kiss In Episode 18, Plus Anna And Elsa After Season 3 Finale?

As "Once Upon a Time" season 3 continues, spoilers confirm that there may be "Frozen" crossover happening in the near future featuring Kristen Bell.

"We would be completely honored if Kirsten Bell or Idina Menzel wanted to do our show," said co-creator Eddy Kitsis to E! Online.

But how does Kristen Bell feel about appearing on "Once Upon a Time?"

"That would be unbelievable. I love that character of Anna so much, she's so exactly who I wanted to see when I was five years old, so she's really close to my heart."

However, chances are "Once Upon a Time" won't do a "Frozen" crossover until after the season 3 finale, when season 4 begins.

Meanwhile, "Once Upon a Time" season 3 is all about Zelena the Wicked Witch, and episode 18 appears to be a doozy.

According to the official synopsis of episode 18, "After Zelena steals Regina’s heart, Regina casts a spell so that she can speak across the realms to her dead mother, Cora, to discover the truth about why she abandoned Zelena, and Belle stumbles across what Zelena’s ultimate end game is."

According to some sneak peek photos from "Once Upon a Time" season 3 episode 18, Zelena and Rumplestiltskin share a kiss, and we will see the birth of Zelena as well!