She is Born
It was a normal day in Ponyville and Twilight Sparkle was in her castle organizing her books. She was still amazed at all that had occurred fairly recently. "It's been pretty quiet since we saved Equestria" Twilight said. "It sure has" Spike agreed "but I hope that something happens again soon. I get bored when there's nothing going on." "I don't mind a little peace and quiet every once-in-a while." Just then, a letter arrived addressed to Twilight Sparkle and she read it aloud. "Dear Twilight Sparkle, I have written to you on account of urgent royal duty. I ask that you come immediately to the Crystal Empire to discuss these important matters. You may bring your friends and no one else. Please, keep all discussed details secret from everypony besides friends and family members. Your faithful mentor, Princess Celestia." The letter slightly troubled Twilight. What if there was a new evil afoot? What if she wasn't doing her part as a princess correctly? But there was no time to worry so she said "Spike, we need to make the necessary preparations for our trip. Start making the checklist right away, please." Once all of the arrangements were completed, Twilight and her friends met at the train station and boarded the next train in hardly any time at all.
On the train, the mane six each pondered what kind of "royal business" Princess Celestia meant. "Maybe some helpless little creature was found all alone and she needs somepony to take care of it" Fluttershy suggested. "Perhaps she's made you a new princess gown" Rarity proposed. "She might wanna know the best places to grow apples" Applejack stated. "She probably wanted me to perform with The Wonderbolts for some kind of show" Rainbow Dash said. "Don't be silly, she probably needs somepony to plan a party for her" Pinkie Pie said. "Whatever it is, it must be important" Twilight noted.
The train eventually stopped at The Crystal Empire. As Twilight faced the gigantic, sparkling palace she told herself "Be strong, Twilight, just because you don't know what's going to happen doesn't mean it's going to be bad." She and her friends walked throughout the palace until she came across a familiar face. That was Princess Cadance. "Cadance!" Twilight delightfully exclaimed, "Twilight!" Cadance happily expressed. The two then exchanged their special hoof-shake (though Cadance did it rather lightly, and you'll soon find out) and chanted "Sunshine! Sunshine! Ladybugs awake! Clap your hooves and do a little shake!" Then, Twilight realized that she might be dealing with some serious royal business and straightened herself up. "Princess Celestia wrote me a letter of urgency" "Well she isn't here right now so I might as well tell you, Twilight." Twilight prepared herself for whatever news was going to be delivered, good or bad. Cadance paused for a moment before finally saying, "I'm pregnant". "What?! Really?!" Twilight said in awe. "Yes, you're going to be an aunt", said Shining Armor.