Pretty in pink … What a great idea. A girl dyed an old wedding dress pink and turned it into a princess prom dress. 17-year-old high schooler Megan Johnson posted a video on TikTok of how she took an old wedding dress she found at a thrift store, dyed it pink, and turned it into her dream prom dress. And it seems her idea is pretty popular. The video has over 14 million views.