"Rarity will give you a makeover so nopony will be scared of you anymore Princess!"
"We think that you put too much hope in friends of yours Twilight Sparkle..."
"Don't be afraid Rarity, It's Princess Luna. You know, we..."
"Oh, I know that Twilight and I'm honored to meet the Princess at my humble Boutique. However this thing you're wearing is just..."
"One more word Rarity..."
I know it's old topic but it's fun anyway.
It's from deleted scene. (for slowpokes whom don't know what's goin' on [link]