It was the night of the party. Rainbow Dash decided on a dress, and Rarity helped her customize it to her liking, a short back with straight blue cloth, and a large lightning bolt brooch at the front of her dress. It was white with no sequins, and had a rainbow stripe from her neck to her flank, on both sides of her dress. She wore her Loyalty Element under her neck.
Fluttershy and Rarity wore similar dresses, although Fluttershy's dress was less fancy, more natural and delicate, and it was a light shade of green with yellow and pink butterflies around the neck, Rarity's being purple, and having rare gemstones replacing the butterflies.
Neither dresses were that comfortable, both the butterflies and the gemstones scratching at the ponies' necks.
They also wore their Elements, of which Rarity disliked, they made her gemstones twist and turn on wonky angles.
Twilight wore her Gala gown, with her Magic Element tiara, proudly showing off her mane in a neat bun.
Applejack and Pinkie Pie were a tad late, Pinkie with a big frilly pink dress that poofed out on the sides, with her Element around her neck. She had brought many sweets with her to share with her friends from Sugarcube Corner. Applejack wore a country outfit, with her trademark hat, covered in large orange gems which were sewn around the sides. Her mane was curly, and she had her hair down, which Rarity and Fluttershy had said looked 'messy'.
She thought it looked 'country'.

Everyone looked their best, and with Vinyl Scratch and Octavia fighting about who should play the music first, in came Celestia wearing a beautiful white gown covered in purple, aqua and pink stripes, with her long mane tied up into a bun, similar to Twilight's. she had managed to get the batter out of her mane, and had cleaned up the flour pretty quickly. Her tiara sparkled against the brightly lit room. They stood ready, as Princess Luna, Princess Cadence and Shining Armor stepped through the tall doors.
Everything fell silent. You could hear Celestia heavily breathing, and a few loud, echoing flaps of wings, but that was all.
As Luna stepped onto the cold tiles, her eyes grew wide. She stared at Octavia, who had won the fight against Vinyl for the music, playing 'Happy Birthday' elegantly, with quiet strokes of her bow against the strings.
Everypony stared at her, with wide smiles on their faces. Apart from Rainbow Dash, hoping that Vinyl would replace Octavia soon with the music. Pinkie broke the silence as she yelled, "HAPPY BIRTHDAY LUNAAAA! WOO!" extremely loudly, jumping in the air an creating a loud crack as her hooves hit the tiles. "Wha... Sister, is this your doing?" She sounded... Well nopony was sure if she sounded exited, surprised, amazed or even angry. Her voice was almost monotone.
"What... What have you done?"

Author's Note

OHHHHH
Maybe Luna doesn't like surprises...
I have to keep writing! :D