"I understand I may have lost a bet with a certain angered fashionista, but I don't see the practicality in wearing... this!"

Celestia motions towards her diapered bottom.

"I need not to wear this thing! It's humiliating! There's no reason for me to be stuck in this now!"

Celestia then sighs.

"But... A gambler is only worth the bets they go through with..."

Celestia goes back to ranting about how she should've never lost to her opponent... In her distracted state, she ends up dropping a mammoth load in her diaper, browning it and making a pungent smell that she seems to overlook.

"She must have cheated! She must have had some sort of... Wait, is everything alright?"