Sense Sonnet - Pumper

"Twin"sation

December 31st, he came,
Then January 1st, came she.
They each had been given a name,
Because 'twas known that they would be.
And soon the world knew they were here.
Media spread the good news new,
End of old and start of new year.
Celebrities became the two.
Being born is a joyed event,
But rarely news around the world.
But this time was quite evident,
Not ordinary be unfurled.

Why the rarity off the chart?
Twins being born one year apart.