Here's how Cadance and Shining Armor's news goes in Thomas and Twilight Sparkle's Adventures with The Avengers.
Cadance: Twilight, I have some news.
Twilight: What is it?
Pete: Wait a second. Cadance, your stomach is plump!
Henry: Wait a minute, is it happening already?! Are you 2...
Cadance and Shining Armor: We're having a baby!
Duncan: [as Hamilton] What?! WHAT?!
Thomas: What nothing! This is great news! Twilight's gonna be an aunt!
Twilight: I know! And this is the best day of my life!
Princess Luna: And there will be a new Princess in Equestria, and will makes us aunts too!
Princess Celestia: Indeed it will, younger sister.
Nick Wilde: But wait! Who are you gonna call her?
Cadance: I'm not shure, Nick. But will think of something.
Sir Handel: I hope it will be a good name.
Cadance: Don't worry, Sir Handel. I'm sure it will.
Sir Handel: I hope so.
Hiro: Me too.