Pinkie: Ha! Yeah Twilight wanted to name him Shimmering Rave, but I thought P.J was better, you know like Pinkie Jr.?  
Party: What is party mommy talking about?  
Twilight: Nothing. Unless party mommy want to sleep on the floor tonight.  
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So this is around the time where Twilight was preggers with Shimmering Rave (which is Twilight’s and Pinkie’s second Child)  
Which you can find here:panti25.deviantart.com/art/NNG…  
While Twilight, Pinkie and Magical Party, Attend a Royal Party or ball (or somthingfdfvdk) Pinkie was talking to one of many ponies she knew there about Twilight’s Pregnancy. It was going to be a surprise for Magical Party that she was going to have a younger sibling, But luckily it still is a surprise, because a couple weeks later they tell her and she’s soooooo happy that she going to have a brother soon.