The reality stars were pictured filming scenes for the ITVBe show earlier this week and we'll see just what happened on Wednesday night's episode, when they join Tommy Mallet at his party.
All we know so far is they have news about a "new arrival"...
Anyone else thinking puppy?!
This is Cara and Nathan's second appearance on TOWIE: their first was back in August when they joined Tommy and his girlfriend Georgia Kousoulou for a spot of bowling.
Nathan has been close friends with Tommy for years ; he was Tommy's apprentice at a carpentry company back in the day and the pair have remained close ever since.
The reality star made his TOWIE debut with girlfriend Cara after fans learned about Nathan and Tommy's friendship, combined with the fact Nathan is from Essex, and urged producers to bring them on the show.
Nathan and Cara told Reveal afterwards that a permanent role on TOWIE would be "perfect", with Cara adding: "We wouldn't be the next power couple, as Tommy and Georgia have earned that title, but we'll settle for prince and princess."
They won the second series of Love Island over the summer.
TOWIE airs Wednesdays and Sundays at 10pm on ITVBe.
TOWIE's most shocking moments: