Zhang Tian'ai, as known as Crystal Zhang, is a Chinese actor, model and singer.
张天爱，英文名Crystal Zhang，是一位中国演员、模特、歌手 。
Her most recent drama appearance was in Sword Snow Stride in which she plays the lethal beauty, Nangong Puye.
She's also in Sisters Who Make Waves S3, a reality TV show which premiered recently.
Sisters Who Make Waves features 30 female celebrities over 30 years old who must compete to debut in a girl band.
According to the 8 Days article, Crystal was the only Sister on the show who didn't mention her age when she first introduced herself.
根据杂志《8 Days》上的文章，张天爱是节目中唯一一个在第一次自我介绍时没有提及自己年龄的姐姐 。
Unlike the others, she merely said she was an actress who has been in the industry for nine years.
According to Chinese media, Crystal's birth year was first reported as 1988.
But when the actress propelled to fame in 2015 after starring in costume drama Go Princess Go, netizens noticed that the birth year had been changed to 1990.
Later on still, it changed to 1992.
As of today, her birth year on Wikipedia is 1988, her birth year on Douban is 1990, and her birth year on Baidu is just left out.
While Crystal herself has not responded to news about her ever-changing birth year, producer Yu Zheng, has.
The 8 Days article quotes him from a video he posted on Weibo, saying, "In this world, younger actresses will always have more opportunities than the older ones.
《8 Days》的那篇文章引用了于正在微博上发布的一段视频，称“在这个世界上，年轻女演员永远比年长的女演员机会多 。
So when an actress changes her age, she just wants more people to notice her, to give herself more chances."
Yu Zheng also asked netizens to not turn this piece of news into a talking point, which is ironic, because thanks to his video, Crystal and her age became a trending topic on Weibo.
Some questioned why he was admitting for her that she changed her birth date, others said he's just making things worse for her.